very slim odds you'll be searched but they won't care if you have a drone with you. You just can't use it if it's over 250 grams and can't use it in any of the Natl Parks.
If you're planning to travel internationally and bring valuable items with you, it's a good idea to register them with U.S. Customs before you leave the United States. This registration serves as proof that you owned the items before your trip, making it easier to clear customs upon your return and avoid potential duties and taxes.
Slim chance of getting searched at the border but the chances are NOT zero.
I was searched on my last trip to BC. They didn't do a deep dive but went through my bags.
It wasn't a hit from a dog either. They just told me to park and wait and a few minutes later I was being told to go to the office while they searched my car.