It's a combination. It's a layered approach. First, we do a lot of pre-screening, whether it's in air or in the marine mode. Sometimes it's officer intuition; other times it's through various detection technologies.
We do take a number of containers aside every day to inspect them, based on risk management and targeting, and a lot of the seizures we get come from that particular process. At other times, the tips we get from our law enforcement partners generate our own intelligence.
It's a variety of factors. Occasionally, it is officer intuition, but certainly we don't rely entirely on that.