[GauntletWizard]

It's fairly common to come in on a "Student" visa to study at a community college or take night courses while also holding a full-time job. It's also common to skip the facade entirely - Use visa to gain entry, take job on forged credentials, stay past expiration. The student visa does allow the holder to work, but it is intended to be secondary to the education, and history has shown that it is not.

[microarchitect]

This is not as easy you make it sound. First, when entering the US, the immigration officials verify whether student status is valid using the SEVIS database. Second, all changes to student status must be reported to the SEVIS database by the school. If the school finds out that a student is doing unauthorized work, or if they find that the student's academic progress is unsatisfactory (likely if they are working full-time) they are required to terminate student status and report this to SEVIS.

The generic issue of using forged credentials to get an unauthorized job is applicable to any visa. And if I wanted to overstay my visa, it would be dumb of me to choose a visa that was as carefully tracked and monitored as as the F1 visa.

[enupten]

I don't think someone who went JHU, and was planning on joining MSR, would be, to not put too fine a point, the kind of person you're alluding to.