Dee10
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This is my interpretation so IMO MOO, etc etc.
They don't want the killer to know HOW he is leaving DNA so that he can't cover his tracks in the future. The forensic techniques may be sophisticated enough that they are virtually unknown by most laypeople.
Honestly, if he is not caught & does it again...how much does it matter if there is no DNA? They have it now on a murder case, they just need to catch him & match it. He doesn't seem like the brightest in leaving DNA at seemingly every turn and a possible receipt...no need to say more.
If it was meant that it would make him mad & go out & try it again, I am not following why he would do that?