I've heard that some programs use a combination of drug testing and psychology. They try to force-feed you their propaganda in hopes of "breaking your will to toke". I've heard of people being financially blackmailed into shit like this (i.e. parents confiscating cars so they can't drive to work), it's fucking evil. Do anything in your power to get out of it. If you do go, swallow your pride and fake rehabilitation. They'll only fuck with you more if you deny.