The empty heat sink gets ejected ~10 seconds after you deploy it, by that time the scan would be long over.
The scan gets interupted if you get cold enough to drop from the scanners of the cops.
But since they can still see you, they can move closer, and below 500m they can always lock you.
Fortunately they are too stupid to stay within 500m for the duration of the scan (as long as you are moving at least), so they try it several times.
Ya this is what I’ve heard before and the impetus for my question - what is “cold enough to drop from the scanners”?