[maro]

How about making aliens expire when their visas run out? Microcapsules implanted subcutaneously that will release cyanide into the bloodstream unless deactivated on or before the visa expiration date by the INS. Too far?

[tracer]

Microcapsules containing anthrax bacilli would be more appropos' (just kidding).....

[185JHP]

Something that would pop 48 hrs. after the visa expired,and cause a distinctive color to appear on their skin, that didn't itch or cause a rash, might pass Congressional scrutiny...