This guy thinks he's a pro.

這傢伙以為自己是個專家。

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

這傢伙認為他是通過掩蓋自己的蹤跡而小心翼翼。

Not with me baby.

不是和我一起，寶貝。

Everybody leaves something behind.

每個人都會留下一些東西。

All I need is one little speck of blood.

我所需要的只是一粒小小的血。

Just one little dr oh yeah.

只有一個小博士哦耶。

Oh yes.

哦，是的。

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

比如這一小滴，你看到他身體前面的血跡，與打擊的角度一致。

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

那麼，這一小滴血在他耳朵後面幹什麼呢？

Could be the killer's.

可能是凶手的。

How soon will you know?

你多久會知道？

Well I got to extract it for DNA.

好吧，我得把它提取出來做DNA。

I gotta amp it.

我得把它放大。

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

我得打出它，它能絕對肯定地告訴我們這一滴血是否與受害者的血液相匹配。

Mhm.

嗯。

Yes.

是的。