Easy, have policies for such situations. Just don’t show up like bin laden is hiding in the home if it’s the third fake call of the week.
And because their entire existence is to show up, you have a conflict of interests on how you answer the call.
And because their entire existence is to show up, you have a conflict of interests on how you answer the call.
After circa the first 10 calls it should start to become apparent.
Imagine how many false swats it would take at the police chief's house before the policy got an update?