Im sure it doesnt end the discussion. This is a discussion board after all. But dont act like I held myself out as some sort of medical expert.
I dont know the exact moment. Im assuming its different. in each case. If a medical device detects a heartbeat, no abortion. I really dont think my opinion is that hard to understand. I dont expect everyone to agree with it. So dont confuse understanding and agreeing.
Sure, on the surface it may seem like a good way to decide the issue. Heartbeat? Then no abortion allowed. No heartbeat? Abortion allowed.
But when you dig a little deeper, you realize it's not so cut and dry. We can probably all agree that at 3 days, the fetus doesn't have a heartbeat. And at 8 months it does. But what about that grey area in between? Is there an exact moment when the fetus goes from no-heartbeat to having a heartbeat? No. Or it is a continuum that can't be broken down so easily? Yes. As the fetus develops, it's tough to draw a line to say "these are some cells turning into a heart" to "this is now a heart."
And how exactly do we determine whether the heartbeat is present? It is going to be different for each pregnancy and dependent on technology at our disposal. So you can't say "abortion ok until week x."
The point it, your criteria appears simple at first glance, but further thought shows it's arbitrary and difficult to assess.
So it's not going to work as a solution to this issue, IMO.