Depends. I'd have to now they have actual DNA recovered at the crime scene that they know belongs to the perpetrator and it is well documented, otherwise they could just take your DNA you gave them and plant it in the evidence and say they found it at the crime scene and then you're ****ed.
My password is password.

No.
Hell no.
Fuck, I ain't even going to talk to them which I have a right to do.
How you die does not redeem how you lived. - A black pastor on the life and death of Charlie Kirk

But what if the perpetrator was my
clone
?

…in the form of semen, ejaculated on their faces?

My password is password.

jestergooning

I'll be the one to write the jokes here, thank you very much.
My password is password.

Depends on what kind of sample they want.
Throughout Heaven and Earth, I alone am the honored one.