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They know everyone's trades. It's reported by all the exchanges. It's just a matter of scanning this DB and looking at the suspicious ones, which can't be that numerous. You can manually check for relationships at that point.

Uhh I dunno say joint tax return with one person on an Amazon W2 and the other person reporting Amazon capital gains on their 1099B? Could it be any easier?

If you looked at the timing of his trades combined with his success, that alone could be suspicious, which could lead to a quick investigation determining he was married to the insider employee.