Can the police gather fingerprints and/or DNA for &quot;exclusionary&quot; purposes without a warrant or arrest? Occasionally on police procedurals some well-meaning or otherwise bystander disturbs the absolute sanctity of a crime scene before Our Heroes&trade; can perform a CSI montage. They might be accosted and asked to provide prints/DNA for "exclusionary" purposes, so any fingerprints found can be identified as the bystander versus an unknown suspect. Can the police obtain these without consent (without an arrest)? If they are provided (consensually or otherwise) are they at risk of being added to some (criminal) database?
You give no jurisdiction but in general: First, police have no obligation to be honest. So, yes they can collect this without consent by e.g. taking hair from your hairbrush (with a warrant) or giving you a glass of water while interviewing you and getting it from your fingerprint oils (which may not actually be technically possible but never mind that). No, they can't take it by "force" by sticking a swab in your mouth. Yes, it will almost certainly go into a database. Of course, there are some jurisdictions where police are entitled to decide you are guilty based on the fact that you didn't pay them a bribe.
A warrant is required: you cannot just bust into a home because the owner died. Nothing that you describe resembles the kind of emergency situation that allows a warrantless search. In order to get a warrant, you have to have a good enough reason. Suppose that campus police found a suspicious object at the scene which was evidence of a crime and which had an identifiable connection to his home. Campus police might get a warrant to search the home, to find evidence related to the possiblity that this was a murder. That evidence could be evidence that he had uncovered a terrorist plot to bomb Needles CA, and he was killed because of that. His home computer might contain records of contact between him and the terrorists: so the judge might grant a warrant. The FBI might also go to a federal court for a warrant for a different suspected crime, for example a planned bombing of Needles. Since this involves national security, this could be a FISA court, which is a secret court for surveilling foreign spies in the US. The daughter has the (apparent) authority to consent to a search – police are not required to inquire very deeply into a person's authority to consent to a search. If she doesn't consent, the police of the FBI might have probable cause for a warrant – it has to be an articulable reason, not just a mystical intuition (TV cop shows notwithstanding) that there must have been a crime and the house has evidence of the crime.
Can a vigilante perform an arrest? This depends on whether the vigilante has the power to perform a citizen's arrest. The rules depend on the jurisdiction (and vary from state to state in the US), but generally the power to perform a citizen's arrest is quite limited. It may include the power to 'pre-empt' an offence if the would-be offender has attempted to commit the offence. However, often the power is limited to particularly serious offences (eg. felonies). There may also be a requirement that the crime occurred in the citizen's presence, or that the citizen was unable to contact the police instead. Is evidence obtained by a vigilante admissible? In the United States, the constitutional exclusionary rule generally prevents evidence from being admitted if the government obtained it illegally. I answered a general question about the scope of the exclusionary rule here. However, the Fourth Amendment exclusionary rule does not apply to evidence obtained illegally by a private individual: Burdeau v. McDowell, 256 U.S. 465 (1921). In Burdeau, the defendant's papers had been stolen and turned over to the government, which proposed to present them as evidence to a grand jury. The Supreme Court said: In the present case, the record clearly shows that no official of the federal government had anything to do with the wrongful seizure of the petitioner's property ... there was no invasion of the security afforded by the Fourth Amendment against unreasonable search and seizure, as whatever wrong was done was the act of individuals in taking the property of another ... We assume that petitioner has an unquestionable right of redress against those who illegally and wrongfully took his private property under the circumstances herein disclosed, but with such remedies we are not now concerned. However, the exclusionary rule in some states goes beyond the Fourth Amendment. For example, article 38.23 of the Texas Code of Criminal Procedure provides that evidence illegally obtained 'by an officer or other person' is inadmissible. This provision was apparently enacted to deter vigilantes: Bubany and Cockerell, 'Excluding Criminal Evidence Texas-Style: Can Private Searches Poison the Fruit?' 12 Texas Tech Law Review 611 (1981), p 625. Can such evidence be admitted even if the vigilante is not present? Assuming that no exclusionary rule applies, evidence obtained by a vigilante can potentially be admitted through the testimony of a police officer or other witness, subject to the rule against hearsay and the question of reliability. The rule against hearsay means that a police officer cannot give evidence that a vigilante told them that the accused was guilty. Evidence of this kind is not admissible because the accused has no opportunity to challenge the reliability of the source of the information in cross-examination. The rule against hearsay does not apply when the probative value of the evidence does not depend on the truth of the absent vigilante's assertion. If the evidence provided by the vigilante is really 'damning' then it might fall into this category. For example, a vigilante might provide the police with a weapon that has the accused and victim's DNA on it, or tell the police that incriminating evidence can be found at a particular location. A police officer can then give evidence that the weapon was tested and found to have matching DNA, or a search warrant was executed and the incriminating evidence was found. There is no admissibility issue here. However, the fact that the police were tipped off by a vigilante who has broken the law and is not present to face court may cause the jury to reject the evidence as unreliable (ie. it could have been planted).
An officer is allowed to pull you over for speeding and then decline to give you a ticket for speeding. So the lack of a ticket has nothing to do with it (unless you actually weren't speeding, not even 1 MPH over.) Simply having past felonies, however, is not a reason for an officer to be able to search the car. Without a warrant, he'd need probable cause, consent, or some other exception to the warrant requirement. It's impossible for me to say what happened here. Maybe your husband had an outstanding arrest warrant? Maybe the officer saw the gun from outside the car? Maybe one of you said "OK" when he asked to search the car? Or maybe the search was illegal after all?
Police are authorized by statutes to carry out the functions of law enforcement. I.e., they are granted by law the authority to: Investigate alleged or apparent crimes Detain and arrest individuals when there exists "probable cause" to believe they have committed a crime. There are a plethora of details encompassed by these general descriptions. For related inquiries see also: How can you tell if you have to follow a police officer&#39;s instructions? search-and-seizure In the specific example you cite you are in a public place, albeit on private property. If the property owner asked the police to leave they would have to meet a higher statutory threshold to legally remain and pursue their investigation. In practice, however, they may do whatever they want. Publicized incidents suggest that the best chance you have of ensuring your rights are protected in a police confrontation are to: Have the incident recorded in audio and video in as detailed a fashion as possible, and seen by as many witnesses as possible. Avoid actions that could escalate the incident or serve as a pretext for escalation by the police. Try to get higher-ranking police on the scene. E.g., if you can safely access your phone you may want to both start video recording and call 911 to ask the dispatcher to send the officer's superior to the scene, while making it clear to the dispatcher that you intend to comply with all lawful requests but that you feel threatened or unsafe.
Such a search would have been emotionally satisfying for many people, but it would almost certainly not have been legal. Evidence that someone committed a crime is not always sufficient to permit a search of their home. An arrest warrant requires probable cause to believe the target individual committed an offense, and a search warrant requires probable cause to believe that the target location will have evidence of a crime. So whatever evidence they had that Epstein committed a crime, they would generally need a separate warrant to search his properties for evidence of that crime. There is no "emergency clause" for search warrants. I imagine you're thinking of the "exigency" exception to the requirement that the police obtain a warrant before searching property, which allows a search in cases where there is an actual emergency, where evidence is being destroyed, or when someone ducks into private property while officers are pursuing them. "Reasonable suspicicion of possible threats to ... potential victims" would not be enough to justify a search based on an exigency. If Epstein is already in jail, he doesn't really pose a threat to anyone, he isn't able to destroy any evidence, and no one is pursuing him anywhere.
Here is an excellent (and extensive) explanation of jurisprudence regarding the "good faith exception" to the admissibility of evidence found due to an error. In short: Yes, the contraband found in Unit B would be evidence admissible in court. (Of course, evidence found in Unit B would only support charges against whomever had a nexus to that property. If the owner of Unit C had no access to Unit B, then evidence in Unit B would not per se implicate him in a crime.) Law enforcement will not return seized property if it believes the property is "contraband." As an example, in Pennsylvania a person can petition a court for return of property seized by law enforcement: Rule 588 requires the petitioner to establish entitlement to lawful possession of the property, but the motion will be rejected if the State successfully argues that the property is contraband, or "derivative contraband" (which has been defined in case law to mean there is "a specific nexus between the property and criminal activity").
It depends on the nature of the crime, among other things. Under Section 8 of the Police and Criminal Evidence Act 1984 (PACE) the police must provide evidence to a court that a search warrant is necessary to secure and obtain evidence relevant to an ongoing investigation into a crime. If there is evidence that time is of the essence with regards to the evidence at stake (e.g. there is a high probability that the evidence will be destroyed unless it is secured immediately) then the search warrant will be expedited. Once the search warrant has been secured, it will be an operational matter for the police to decide when and how to act on it. They could choose to do a dawn raid, for example, or they could monitor the suspect for a week and then search the property when the suspect is out. Be aware that under Section 18 of PACE, a search warrant is not necessarily required. The police may, in the course of arresting someone for an indictable offence, search the premises without a warrant provided certain criteria are met. Of course, this is predicated on the police having grounds for arrest, and in the vast majority of cases, a search warrant will be obtained.