That depends. If the officer alleges the suspect took one of his weapons, then that should make it evidence and part of a crime scene. And should remain undisturbed and secured.
Yeah, if that’s what the officer believed and if there was someone to secure the scene. If he didn’t think it was material, he’d just collect it.
Bottom line is that if you’re going to plant a weapon to justify a shooting you plant one that could do actual harm from a distance, not a discharged taser.