Umm... I don't think so. SWAT is nearly everywhere, when I kill the first wave, a second one comes, I defeat the second wave, I just run outside. But still, there's cops with shotguns, police helicopter, SWAT etc. and I have no access to nearby vehicles because the cops are surrounding them. I tried jumping in the water only to realise that when you get 3 stars, police boats chase you and shoot on sight. It's hard for me, it would have been easier if I used cheats, but I don't want to do that.