IDA or OllyDBG (I personally use OllyDBG for my stuff, but I think Aaro uses IDA). Basically, be able to look at:
CMP EAX, 3 //Imagine this is the value that gets changed according to the number of cops after you
JGE 004592 //Jumps to address if greater or equal
and say "hmm, I think that's where it checks if it has more than three cops. Lemme just try something out...
CMP EAX, 3 //Same as before
NOP //Does nothing
"Oh look, I can now have infinite* cops after me! Yay"
*not actually infinite, but you know what I mean.
So, erm, this is a very basic, and easy hack/ fix to do. Some that Aaro has done I can't even begin to comprehend how he did them
(Oh, and that was the phase in where you test the new code out, first comes the phase to find out where the problem even is, and that's the cool one
Protip: it isn't very cool actually)