Who not to choose if you want to pick somebody's pocket

Hint: a former Marine and Golden Gloves champion is probably not a good target. Even if he is 72 years old. The full story is on MSN here, but I found this YouTube video that is the actual surveillance. From a click on Detroit story:

"There was blood everywhere," said another manager on duty, Abby Ostrom, 25.
Barnes was a regional runner-up in Golden Gloves competition in the novice and open divisions before enlisting in the Marines in 1956.