Completely unconstitutional.

Drug checkpoints are unconstitutional. Period. Stop. End of Story.

The Supreme Court has allowed limited checkpoints for two specific purposes:

1. Internal immigration checks: "U.S. citizens?" "Yes." "Have a nice day, sir." Lacking articulable reasonable suspicion or probable cause, it ends with that "yes" response. Checking every trunk clearly shows that they are over the line.

2. Sobriety checkpoints for public safety : Must be random and cannot stop every car. That last point is very important -- a sobriety checkpoint that stops every vehicle is illegal. Never mind that concentrated drunk driving patrols have been shown to be much more effective at catching drunk drivers.