I'm currently on probation as well so I know how you feel, but substitution is tricky under the circumstances they put you in. I'm not a woman so I don't quite know how your being watched. It's way harder for guys though, but if you wanna give it a shot here's the link to the substitution guideline.

http://boards.cannabis.com/drug-test...uidelines.html

If I were you I wouldn't risk it though. Failing a UA while on probation can get nasty, but if the substitution method doesn't seem best; follow the dilution sticky. It's your best bet and has worked for me, but I can't guarentee it'll pass every time especially if your thinking about smoking heavily.