Hold while chasing a target on foot or in a car to keep an eye on your target. This makes chase scenes easier.
When you close in on a suspect on foot, press repeatedly to tackle the suspect.
During a car chase, pull up alongside a driver to have your partner fire at him. If he shoots a tire, the car will slow down while emitting sparks from one wheel. A faster way to take out a driver, however, is to slam into a rear wheel to spin the car out of control. T-boning a suspect at an intersection is another effective way to take them out.