What is the significance of a clover-shaped flight track? These are portions of two flights by a Cessna T206H on separate days:

 

The cloverleaf portion of the track was flown at around 8200 feet altitude. This plane is typically seen over the Los Angeles basin flying "lawnmower" patterns similar to those that might be used for sterile insect technique flights or aerial imagery collection flights.

What is the significance of this pattern?  Could it be for radio direction finding?

Edit: The aircraft is N915WC, which is registered to a company that specializes in supporting the intelligence community and law enforcement.  I didn't mention that initially because I didn't want to bias people's answers, and I was curious if the pattern was distinctive enough to identify without that information.
The flying looks too sloppy for a ground reference maneuver, a performance maneuver, or other required academic flying.  Given the concentration of the same flying in that same area and a review of the VFR sectional for the same area:  



This is probably some kind of training flight.  If it is for law enforcement, I'm not sure what is going on here.  One possibility is that it is a student practicing attitude instrument flying doing 'A' and 'B' patterns under the hood with an instructor - or at least trying to.



Another possibility is just standard flight training activities, periodically turning to avoid terrain or congested airspace in order to operate within these confines.