Homicide Desk "The Golden Butterfly" when chasing Hugo Moller
There are plenty of other opportunities in the game but this one is the easiest.
The way to tackle in the game is when you get close enough in a foot chase you'll get a "tap A button" prompt in the top left of screen. Tap A repeated and quickly to give Phelps a speed boost and he will tackle the person being chased.
After visiting the Moller residence you'll be waved over by a neighbor, after a short interaction with her you'll be prompted to chase down Hugo Moller and apprehend him. He moves pretty slow and there will be ample opportunity to get close and tap the 'A' button to take him down.