I'm having a little trouble understanding what you are saying happened.
So, you were in DMU? What is DMU? The only thing I could find that said DMU, was Decision Making Unit. That was supposed to last 3 years. Then, you had a drug screen? What were the results of the drug screen?
I have seen an instance where a participant had a positive drug screen early on, in IPN. They began her monitoring contract again and she completed. She had to go back to IOP though.
It's always good to have an attorney. But it would help to know what you mean by the drug screens. If you have agreed to participate in a program and one of their requirements are negative drug screens, and you have a positive, you will probably get an extension. And it's anybody's guess as to how long it will be.