If you really want to know the answer to that, then you'd have to quantify the total possible number of potential shooters, then setup a police officer or federal agent for every single one. How many do you think there are? Is such an operation even possible? Do you really want to k ow the answer?
OK, there's all sorts of WTF going on here. Thumb ring, "positive energy", Calendar is fucking worthless for current day. That tie pin is fucked, but not overly suspicious. Still. WTF.