Drug Facilitated kits

I would like to know if any other programs are being asked to do drug facilitated kits just to validate the use or non use of alcohol or drugs by the victim?
It seems that the real purpose of using the kit when it is suspected that the victim has been given a substance that compromises his or her ability to consent has been lost.
Since informed consent is needed we do inform the victim the reason for the blood draw... they then can refuse it if they so choose.
Thanks for any input.