The answer is stakeouts. The stakeouts are successful in cases in which the police obtain a tip that a crime is going to happen in a commercial establishment or in which the police find out or come upon a pattern. In addition, a police stakeout is where officers are fundamentally hidden and set up with distance surveillance equipment such as binoculars and cameras. This is typically for capturing evidence but it can also be the watching post for a team about to move in on an offense.