In case of using what communication channels a person does not have a reasonable expectation of privacy? In what scenario(s) a person doesn't have a reasonable expectation of privacy? sending a traditional letter or parcel via the U.S. post using work email account for sending private emails making a cell phone call listening to ones own cell phone's voicemail Expectation of privacy is a legal test which is crucial in defining the scope of the applicability of the privacy protections of the Fourth Amendment to the United States Constitution.
I presume you are addressing the various wiretapping laws. In all of those channels, one would have a reasonable expectation of privacy, in contrast to using CB radio or a megaphone. However the context of using the instrument affects that expectation, for example if your phone is on speaker you do not have a reasonable expectation that those around you cannot hear your conversation, when there are others around you. Also, there is no expectation of privacy surrounding employers monitoring employee emails for valid business purposes – but the federal government can't intercept your emails (without a warrant) just because you are using business email. The expectation of privacy is really about the surrounding circumstance, not the instrument you use.
No The right to Due Process is a personal right of anyone who may come before a US court, or interact with an agency of any US government, Federal, State, or local. It is noit a national right, to be granted ort withheld depending on hoew US nationals are treated by a particular country. No one has authority to deny De Process to anyone who is physically within the US, nor to anyone who is interacting with any part of the US government/the Fifth and Fourteenth Amendments require the Fedferal and State governments, respectively, to grant Due process to al, and congress may not alter this by law, nor authorize any poat of the government to deny Due Process to anyone for any reason. Due Process is a somewhat flexible concept, and exactly what process is required may vary in different circumstances, but the basic elements of Due Process are not optional. All this is true no matter ow unjustly the courts or other agencies of a foreign government may treat US nationals. Such treatment may be addressed through diplomatic channels, or through economic or political pressure.
Invasion of privacy and false light torts would probably not be applicable here. Very few states have adopted the false light tort because of its conflict with First Amendment principles and there was no agreement or even request to keep the text private. The copyright issue is trickier. First all, the TOS may provide that the copyright belongs to the text service provider or that there is a license. But, even in the absence of an express license, sending someone a message which is equivalent to sending them a letter, probably gives rise to an implied license that the person to whom it is sent can use the message that arises merely from the act of sending it without restriction or qualification. Implied license and fair use also heavily overlap. Publishing the text exactly as it was sent to you protects you from defamation liability because it is true. On the whole it would be extremely unlikely for there to be any legal liability for publishing a text from someone that they sent to you. Of course, one can imagine exceptions. If the person receiving the text was in an attorney-client relationship, or priest-parishioner making confession relationship, or was communicating regarding classified national security matters, or there was a non-disclosure agreement in place, among other possibilities, an evidentiary privilege and duty of confidentiality could apply and disclosing the material without the permission of the privilege holder could breach a duty of confidentiality and give rise to liability. If the picture was a nude picture of a minor, there could be a criminal and/or civil liability issue, and some states have also made posting "revenge porn" a criminal offense and/or a basis for civil liability. If the disclosure was effectively a way to facilitate insider trading that could be a problem. If the contents of the text were accurately transmitted but known to be false and were disseminated without disclosure of its falsity for the purpose of defrauding a third party, that could be a problem. But, no facts that obviously flag any exception are identified in the question. The mere fact that the posting may be embarrassing, or hurt someone's reputation, or was made without someone's express consent, in general, would not be a basis for liability.
In general, people have less expectation of privacy in cars than in their homes. To challenge a search and/or seizure under the Fourth Amendment, a person must have standing - the right to sue (that is, you must have had a reasonable expectation of privacy in the place where the search happened; if you didn't, no standing - can't claim your privacy was violated if you had no privacy). The US Circuit Courts are split on the issue of unauthorized rental drivers and whether they have the same reasonable expectation of privacy as the authorized driver of a rental car would have. Some Circuits allow the unauthorized driver to challenge a car search if the authorized driver gave them permission. Some Circuits look only at the agreement and if the driver isn't authorized on that, they're out of luck. The 6th Circuit is more case-by-case, with a presumption that driver can't challenge the search that can be overcome based on the facts. (All this info from US v. Haywood, 324 F.3d 514) There's a current case before the Supreme Court (argued January 9, 2018), Byrd v. US, on this very issue. This SCOTUSblog page has a lot of information on the case. Edited to add: Texas is in the Fifth Circuit, which follows the rule that unauthorized drivers don't have standing to challenge a search/seizure even with the authorized driver's permission to drive the car; unauthorized drivers of rental cars don't have a reasonable expectation of privacy because they lack a possessory interest in the car and/or they're violating the rental agreement. Basically, even though it seems the cops' stop of the car would've violated the Fourth Amendment if he were the authorized driver, since this happened in Texas, he's not going to be able to challenge the stop. IMO, this is incredibly unjust especially when the cops admitted there was no probable cause, so hopefully the Supreme Court makes this rule obsolete and allows unauthorized drivers to exercise their Fourth Amendment rights. Some law review articles on the topic of unauthorized rental drivers: "Hertz and the Fourth Amendment" "Resolving a Three-Way Circuit Split"
There are various tangential ways in which this could be illegal, for example if your subjects are celebrities, you take a picture of them and commercially exploit it without permission in a product endorsement. Leaving aside such fringe cases, in the US, the legal right to privacy comes about, at the first cut, by premise trespass law. If the proprietor tells you to go away, you have to go away; if the proprietor tells you that you cannot take pictures, you cannot take pictures (your right to enter is conditional). Neither of those circumstances holds in your case. There are other tort-law bases for a right to privacy: numerous privacy laws regarding privacy and financial transactions (not relevant here), the aforementioned right of publicity (commercial exploitation of likeness), false light (like defamation, about creating a false impression – I don't see what false information is conveyed by a photo). There is also public disclosure of private fact, but that cat is out of the bag because the subject has self-disclosed the supposedly offensive fact revealed by the picture by eating in public. Intrusion of solitude and seclusion does not exist in the circumstance, since the subject is eating in public where everybody can see: there is no reasonable expectation of privacy. This page sums us Virginia law. The main take-away from that is that there is no common law action for privacy in Virginia, and only an action for unauthorized used of likeness or name.
This question and many related ones are analysed in detail by Eugene Volokh, in a long paper that is worth reading in its entirety if you are interested in the topic. The [Supreme] Court has offered “speech integral to [illegal] conduct” as one of the “well-defined and narrowly limited classes of speech” excluded from First Amendment protection. But if this exception is indeed to be well defined and narrowly limited, courts need to explain and cabin its scope. This Article — the first, to my knowledge, to consider the exception in depth — aims to help with that task. On threats, he says: Companies are generally barred from firing employees for voting for a union, and unions are generally barred from retaliating against employees for their speech. The Court therefore concluded that speech that threatens unlawful retaliation is itself unlawful. On blackmail, he says: [...] telling black citizens “stop shopping at white-owned stores or we’ll publicize your behavior to your neighbors and fellow church members” is similarly constitutionally protected. On the other hand, “vote for this civil rights bill or I’ll disclose that you cheated on your wife” is likely unprotected. In general the line where the First Amendment protections end and criminal speech begins is surprisingly vague. General advice to avoid self-incrimination by not answering questions from the police is clearly protected. Threatening a witness with violence is clearly not. In between are shades of grey.
It is unlikely that it is a felony to enter a SCIF with a cell phone (or thumb drive, Apple Watch, fitbit etc). The felony clout comes from the non-disclosure agreement which references Sections 793, 794, 798, 952 of Title 18 and Section 783(b) Title of Title 50 -- gathering and disclosing information is a felony. A non-exhaustive reading of the relevant chapters of the US Code does not provide any evidence of a felony charge relatable to phones and SCIFs. There is a federal law against knowingly entering or remaining in any restricted building or grounds without lawful authority to do so. This includes knowingly, and with the intent to impede or disrupt the orderly conduct of Government business or official functions, obstructs or impedes ingress or egress to or from any restricted building or grounds which protects against intrusion of a building or grounds so restricted in conjunction with an event designated as a special event of national significance The courts would almost certainly hold the recent event to be a non-justiciable political matter.
In US law, there was, as far as the question indicates, no probable cause to search her phone at all, Therefore (unless there is some cause not mentioned in the question), any such search is illegal, and any evidence found in such a search, or that is found as an indirect result of such a search (pointers toward it are found in the search, and followed) would not be admissible in any criminal case against Alice. In the case of Bob, if his friends and family approach the police or other authority with a vague suspicion that Bob might be involved in the creation of illegal content That will probably not constitute probable cause for an arrest of Bob or a search warrant for his phone. Unless the accusation does prove to constitute probable cause, any evidence found during such a search would not be admissible against Bob in a criminal case. In practice, most US police would not undertake either search without better evidence than is described in the question. But some police will overstep the lines, which is what the US exclusionary rule is for. Legal procedure does not as far as I know make a distinction between "exploratory" and "confirmatory" evidence. Instead, evidence is either admissible or not. The rules for when evidence is admissible are quite complex, and vary by jurisdiction. Some of them are more traditional than logical, and some of them are addressed to particular problems that have arisen in particular circumstances. But the US Fourth Amendment protections against unreasonable searches, and the requirement of probable cause before search or arrest warrants are issued, serves some of the same purpose. Other countries have different rules, but many of them restrict the authorities to some extent from making arbitrary searches with no initial evidence. Response to the Revised Question As the question has been edited, there seems to be fairly clear probable cause to search Alice's phone, and if clear evidence of "illegal pornographic content" presumably actually child pornography, as no other kind is illegal simply to posses) is found, she can be brought to trial and perhaps convicted. The mere "suspicion" of Alice's "friends and relatives" would add little and mi8ght well not even be admissible. The facts, if any, on which those suspicions are based might be admissible, one cannot tell from the summary in the question. The case against Bob, however, remains weak. Indeed there still seems to be no probable cause either to arrest Bob nor to se3arch his phone, and the results of any search that was done would not be admissible. Probably none would be done without more evidence. The OP wrote: Thus, although the situation looks grim for both, since the evidence against Bob is confirmatory, it might be considered stronger. Not so, the case against Bob is weaker, indeed so weak that an arrest would be unlikely, and if one were made, the case would likely be dismissed before going to trial, assuming no more evidence than was included inn the question. The evidence prior to the search seems to consist only of vague suspicion not supported by any actual evidence, and so there is nothing to confirm, and no valid search would occur. That suspicion of Bob came before the search, and the search is thus "confirmatory" is not relevant. The question is, what evidence against each defendant is admissible, and does the totality of the admissible evidence amount to "proof beyond a reasonable doubt" no matter what order it was discovered in, or what idea was in the minds of the investigators, provided that they were acting lawfully so that their findings are admissible.