It is very difficult to follow the question from the lack of punctuation. It appears you got an adverse result in court due to failed drug tests (either alleged or actual). But there is no actual question asked. If the question is whether allegations of drug use on mixed evidence can be used by a court, the answer is "probably yes." if you think the tests were inaccurate, and wish to show yourself as clean and sober to revisit custody, go in for re-testing; that too would be a "changed circumstance" warranting a motion to alter the custodial order -- probably. Lots of facts are unknown, so before you go to court you should look over the standards for child custody modifications here, and probably consult with a family law specialist.
Answered on Jun 06th, 2017 at 2:06 PM