The only way I know he is getting them from her is spying on his emails
Which is illegal also...
I would talk to your L tell him your concerns and see if as a condition of him seeing your baby he has to take a drug test, after each visit...that way you know if he was using during the visit, if he gets unsupervised visits.
Me:40 W: 39 T: 17 years M: 15 years S-9 D-6 D final 11/10/2009
"We are all faced with a series of great opportunities brilliantly disguised as insoluble problems."