Or they could do what they do at Disneyland Paris. When you pull up to the resort, the security guard actually inspects the vehicle & looks in the trunk. Only after looking up our reservation, does he open the gate.
Then once we pulled up to the front of the hotel, there's a large tent set up with metal detectors, xray and the whole bit outside. Not random; it's required for everyone walking through the front door. ALL luggage, bags, etc. goes through the xray, like we're at the airport. We go inside and all have to stop again just inside the door to get wand-checked so we stop and spread em like a starfish and then go to check in.
This all happens again on our way to the parks. It's a much smaller property there and our hotel (Newport Bay Club) is an easy walk from the back of the resort to get to the parks, through their mini version of Disney Springs but before we can even get to it, we go through metal detectors, empty pockets, xray bags, etc. After 3 days of this, we were so used it, it didn't even seem weird.
I have to admit, I felt pretty safe there; much safer than in Paris despite a very heavily armed police presence.
Either do it right, or don't do it at all. Random checks are silly. We went to WDW a few weeks after our DLP trip. Ds17 laughed at the security theater at MK's gate saying "Is this supposed to make me feel safe? The don't even check a quarter of the people entering."