Can a family court judge allow a search of defendants wallet without consent or subpoena just because the plaintiff's attorney asked for?

To the best of my knowledge, no one has ever challenged an in-court order from the judge to take a drug test, reveal the contents of a wallet, show a tattoo, etc., which kind of orders are actually made all the time -- so it is hard to say what the limits on judicial power of that kind would be (the question is not so much a family law question as a criminal law/Fourth Amendment question).  If it was demanded, and you complied, there is probably little you can do about it at this point; if you refused, and were detained, consult with criminal defense counsel for your options.