Proving a deauth attack

I think this would be the right place to ask this question, but if not, let me know if there's a better sub to post this.

I am looking for some input as to how you would go about proving a deauth attack with enough evidence that would stand up in a court of law. As an example, I'll say let's use hotels as the culprit in this as they are notorious for spamming deauth messages over WiFi to force users to use their (pay-per-use) WiFi.

So this is a case where you know they are spamming other WiFi channels with deauth messages and need to gather enough evidence that it would hold up in court. What apps or programs would you use? What information and screenshots would you gather?