> As far as I understand, overhearing a stranger discussing a deal at the local Starbucks and trading on that, is perfectly legal. But overhearing your wife dis

> As far as I understand, overhearing a stranger discussing a deal at the local Starbucks and trading on that, is perfectly legal. But overhearing your wife discuss a deal and trading on that is illegal, as it is a breach of trust. I believe this is technically incorrect. If the information you heard inadvertently was non-public and you trade on it, that is still illegal.