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If there isn't any formal custodial or visitation order in place from the court, then if you are on the birth certificate as the father you both have exactly equal custodial rights to the child. What this means is that whoever has the child has a legal right to do so. So to answer your question directly, no, it is not unlawful for the mother to refuse to disclose where she is moving to the father of the child.
In order to establish a formal custody schedule, you would have to file a divorce action and then ask the judge to address the child custody issue as part of the divorce case.
Otherwise, if you can find out where she is, legally you could simply take the child away from her and refuse to allow her to see him. So it works both ways...you wouldn't have to let her see the child if you had physical custody of him.
But if you feel that she is using drugs again, then you could make a report to Child Protective Services and see if they would investigate and potentially remove the child from her and place him with you.
No, not legally. If she did, then your recourse is to file a motion for contempt of court and force her to appear in front of a judge and explain why she was willfully violating his direct order.