The SLED Test is a simple argument against abortion.
The pro-life view is that the unborn are human beings just like you and me. That’s why it’s wrong to kill them. Although many abortion-choice advocates agree the unborn are human, they deny they are valuable human beings. They think this distinction justifies killing the unborn.
Often they use personhood language to express this view. They say the unborn might be human, but it’s not a person. When confronted with this claim, ask a simple question: “What’s the difference between a human being and a human person?”
They must answer this question. Why? They’ve just made the incredible claim that there are human beings that can be killed with impunity because they are not persons. What are their reasons for this view? What’s the difference between a born human and an unborn one that justifies killing the latter?
Abortion-choice advocates typically cite one or more characteristics they believe make a human being a person. Each of these characteristics fall under one of four categories.
You can remember these categories with the acronym SLED: Size, Level of development, Environment, and Degree of dependency.