[HiJinx]

Rock-Chucker Ping!

Then scan every one sneaking back in to find the repeats.

That only works when they come back through a Port of Entry manned by immigration officers? Do you have a freaking clue what percentage of illegals do that? Try less than one in a thousand.

[Syncro]

Well duh.

My plan (sorry to not to have supplied all the details) would include hiring enough Border Patrol agents to find every criminal sneaking into our country and equipping them with a scanner.

Or the second choice would to have a scanner 2,000 miles wide. Suspended over the border with sky hooks.

That would be best IMO.