In determining what is in the children's best interest, the court must consider things such as the "habitual or continual use of controlled substances" or alcohol abuse by either parent. However, the judge has NO AUTHORITY whatsoever to order you to submit to drug testing simply because your ex heard that you use drugs. In my opinion, the court has no authority to order a drug test as that would be judicial over-reaching on the court's part and is a violation of your privacy rights.
The Code states that a court may consider drug/alcohol abuse when there is independent corroboration: "Before considering these allegations, the court may first require independent corroboration, including, but not limited to, written reports from law enforcement agencies, courts, probation departments, social welfare agencies, medical facilities, rehabilitation facilities, or other public agencies or nonprofit organizations providing drug and alcohol abuse services."
I am including links below which may be of some help. Good luck.
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First off his statement is hearsay and TOTALLY unreliable. If you handle this right-- calmly-- wild unfounded accusations can be more of a reflection on the accuser then on you. But no the court will nor order tests on you and has NO jurisdiction over your mother.
If the two of you cannot avoid ugly battles abut fitness the means is a 730 eval. Expensive--but admissible.
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Because hearsay statements are not considered permissible evidence in court, the courts cannot force you to take a drug test. Other than that, I would recommend you seek counsel with a local attorney. You don't have to retain the attorney, but I would imagine you would feel a lot more comfortable entering the court room after meeting with an attorney.