Drug screening should be manditory in schools only after they are mandatory for ALL public officials. Officials should be screened as often as the students, and of course a few random tests as well. Would that pass in congress??
It probably wouldn't pass in Congress, but the proposal he's talking about is to do mental health screening on all school children.
This should include random audits of bank statements, credit cards, assets, tax returns, etc. as a condition of employment. A $400 billion underground market can buy off a lot of officials.