TSA and thefts from luggage at LAX: How common is this?

From the latimes.com:

In the last two months, two U.S. Transportation Security Administration officers have been arrested on suspicion of stealing from passenger luggage at Los Angeles International Airport (LAX) -- incidents that leave me worrying about how often such theft happens. Judging from official statistics, it seems rare -- or maybe the culprits just don't get caught very often.

On Thursday, TSA officer Paul Yashou, 37, was arrested on suspicion of taking $30,000 worth of items from suitcases at the airport, according to this Daily Breeze story, which also said that a police search of Yashou's home turned up 'numerous items belonging to LAX passengers.'

TSA spokesman Nico Melendez said Yashou worked at Terminal 1, where the baggage screening area is in a very public lobby area near ticketing counters. (Side note: Having flown out of Terminal 1 many times, I wonder how the alleged pilfering could took place out of view of other TSA staffers or even passers-by. Melendez said he didn't know either.)