Drain pipe drips at a joint only when water runs through it
A drain line that drips only while water runs through it has a failed joint, and failed joints are repaired. Nothing in a drain is under pressure, so a plumber cuts out the bad fitting, glues or tightens a new one in its place, and tests the run. The pipe either side of it stays. Dry the pipes first, then run one fixture at a time and watch, because several wet joints in one section point at a run that is unsupported and gets rebuilt rather than patched.
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