The Wormhole wrote:
Why would they? They're meant for recreational purposes, they don't pose a security threat.
It would also seem that Starfleet is much more forgiving when it comes to inappropriate behavior. Hell, Worf killed someone in cold blood (consistent with Klingon law, however), and Picard let him off with a reprimand.
A better example is on DS9. In S4 Sisko chews Worf out over attempting to kill Kurn, which again is allowed under Klingon ritual. But then in S7, Sisko drops hints about challenging Gowron, which Worf does, kills him, and presumably Sisko is cool with that.