system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: Curtailing illegal immigration can be accomplished more efficiently and effectively by enforcing hefty penalties against employers who hire undocumented workers.

Restricting the supply of undocumented workers by building a wall and rounding people up for deportation is prohibitively expensive and doomed to fail. The costs associated with building a wall would be astronomical and the process would be mired in expensive litigation for years, to the point it would never be finished and would therefore never accomplish its purpose. Additionally, identifying, arresting, housing, and trying people awaiting deportation would be ridiculously expensive.  Cutting the demand for undocumented workers by severely and publicly penalizing those who hire them would be cheaper and more effective. Doing so would also provide consumers opposed to illegal immigration with information necessary to make informed buying decisions and further disincentivize the practice.
gpt
This is already how the law works, but it's flawed and your proposition can only hurt good employers. E-Verify is the system that good employers use to check the information given to them by a potential employee and ensure the employee is legally able to work in the US. Once E-Verify says that the information matches up and the person is legally able to work, an employer cannot question that employee's immigration status in any way. The problem is that a lot of undocumented immigrants fill out those forms to be used in E-Verify, like the I-9, with *someone else's information*. There's no way for E-Verify to tell an employer that the information belongs to someone who isn't the employee. E Verify only says "Yup, the person by the name of [name used by employee] is legally allowed to work". Once that happens, the employer can't do anything else to confirm or disprove the person's identity or immigration status. What you proposed here, tougher penalties for employers who hire undocumented immigrants, *might* dissuade some employers who *intentionally* hire undocumented immigrants, but there are many many many good employers who will get punished for just following the law to the best of their ability.