Any business with cheap products and little traffic. I live in a high rise with a view on a street with many little shops.

In my street there's a shop for wedding dresses 2-3k $ a pop. I understand it's not high traffic so whenever there is a car parked in front, usually for a couple of hours, it's probably a customer.

Then there is some convenience stores. All have heavy traffic, from the corporate one to the local mom&pops shop.

Then there is this small sushi joint. Open for 3 hours everyday. I've never seen any customers sitting inside or walk in. Can't find them on our local food delivery. Twice a week there's the same blue Mercedes parked in front.

Not difficult to spot which business is sus.

Sad thing is, the police pops into that sushi joint the same day that blue Mercedes was parked in front.