So, was this guy (and yourself) subject to random urinalysis to determine if you've been smoking? Did the entire workforce agree to that, or did Scotts say they'd just do it?
Chances are if they run it like the drug testing, people won't be tested again unless they're off work for a couple months and then come back.
If this guy was smart he would have quit a few weeks before testing and probably would have been home free for the duration of his employment.