when does a human being become a human being?

[FutureIncoming]

Fact Again If DNA evidence can be used to prove a person is at a crime scene

FAULTY LOGIC. All that DNA evidence does (so far) is prove that some human was at a crime scene. Eventually, of course, in any future where humans interact with extraterrestrial intelligences, we could expect to see ET DNA being used to place an ET at a crime scene. Thus the fault with your logic is in the unsupported assumption that "human" equates to "person".

The same DNA evidence can be used to prove a person is in the womb.

No, it only proves that a human animal organism is in the womb. It does not prove that that human is a person.

Again at conception the baby has his or her own DNA making him or her an individual OK I know about Identical twins They are individuals to.

And an ant qualifies as an "individual", too. So? An "individual" is not the same thing as a "person", either. (The word simply refers to the smallest unit --equivalent to "indivisible"-- of a group.)