Michigan and Roadside Drug Testing

From an article in today's FREEP, Michigan may be the first state to adopt roadside drug testing.  The bill was introduced yesterday in the legislature.  See article here http://www.freep.com/article/20100909/NEWS06/9090347/1001/rss01

According to the article, if a law enforcement officer suspects drug use/impairment there is not an easy cost effective way to verify the suspicion other than warrants and hopital tests.  This type of law is already in use in Australia and Europe.

Standard portable kits can detect the use of marijuana, cocaine, and methamphetamines.  These type of kits are already in use by correctional facilities.

What are your thoughts, will this proposed law subject thousands of drivers to illegal, unnecessary drug testing or will this proposed rule lead to more rational drug laws?

Astrid