I go to the park once or twice per week arriving at various times. The police officers haven't been constant, and I haven't seen more than 2, even when 3 tents are open. Sometimes they have uniformed Disney security instead of police officers. Sometimes in the early afternoon they don't have either standing in the immediate area of the tents. The CMs who do the bag checks rotate with the turnstiles. They are not security and I doubt they've been trained to look for much other than alcohol or things like picnic supplies and cans of spray paint or adhesives that might damage the park. I imagine that the police are there to make people feel safe or think twice about bringing in a weapon. Or for the bag check CMs to call if a guest admits they have their gun, like an off duty officer. But I've seen guests pull out pockets knives inside the park several times. If Disney was worried about weapons they'd have metal detectors and the bag checks would be done by actual security CMs.