WOW, you should have asked about this before agreeing or doing anything.
OKAY, in the future, never, ever agree to voluntarily speak to the law enforcement, any government agency, etc... IF THE ISSUE INVOLVES potential criminal liability for YOU!
God only knows what you signed.
By signing that document, you obviously gave them some authority over you.
DFACS had no authority to require you to take any kind of drug test, heck, even the police can't cause you to do that - EVEN if they have probable cause. You can refuse, there will be sanctions, but only a judge can order fluids or bodily samples to be collected form you against your will.
Moving on, you desperately need a lawyer.
At this point, only a lawyer can help you.
But, your case interests me (few do these days and I'm a lawyer), so I'll try to advise, assist, and offer you some guidance.
This is NOT, nor can it ever become a lawyer-client relationship, but I'll offer you some insight about these processes based upon my legal knowledge and expertise. You're lucky, because I also generally despise DFACS, CPS, CFS, initials representing any Official State Approved Child and Family Destroyer Agency or Bureau.
Hopefully, it'll be of some value.
Please provide another post detailing what went down, on what dates, and post the contents (leave out ALL REAL names, use FAKE NAMES) of EVERY document you signed.
I suggest you do the following things tomorrow morning ASAP:
1 - visit your local legal aid office (they will listen to you, and offer you advice, good advice; but they won't take your case in all likelihood)
2 - after legal aid has advised you, ask them if they know of any criminal defense or family law attorneys that will assist indigent people (YOU) on a PRO BONO basis (for FREE)
3 - come back and give us an update after you have done the above tasks
Whatever you do, obey what you have agreed to do.
Don't get caught violating this bit of state TRICKERATION until we know more about it, because you don't want to make more trouble for yourself.
Are you on state parole, probation, or any type of supervised release?
Are you under indictment for any crime?
Have you been charged and are awaiting trial with any crime at the moment?
Are you out on bond, after having been arrested for any crime?
Have you been convicted of any crime? If so, what crimes and when?