Very much a line-of-sight thing, so ducking around corners (several times) to break that is key. Also, as DMG said, there are some slightly logic breaking methods, like the swimming, or heading straight up the side of a mountain where the A.I. struggle to locate you... 4 stars so far, dread the think how involved 5 is going to be to evade
Losing the filth in this is much harder than 4. The amount of time you have to be out of view for a three star crime seems way longer. Any tips?