Deleted member 115407
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Maybe you could have the decay be relative to the square of the level? An hour at 1, 4 at 2, 9 at 3, 16 at 4, ect? It would take little over 2 weeks to go back to 0 from 10, but the occasional accidental crime would still have a quick decay period.
Not to split hairs, but it's pretty hard to accidentally commit murder.