This guy thinks he's a pro.

This guy thinks he's being careful by covering his tracks.

Not with me baby.

Everybody leaves something behind.

All I need is one little speck of blood.

Just one little dr oh yeah.

Oh yes.

Like this little drop for example you see the blood spatter on the front of his body that matches the angle of the blows.

So what's this little drop of blood doing all the way back here behind his ear?

Could be the killer's.

How soon will you know?

Well I got to extract it for DNA.

I gotta amp it.

I gotta type it that will tell us with absolute certainty whether or not that drop matches the victim's blood.

Mhm.

Yes.