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A lot of girls and women I've known to go to these places are going to get a pregnancy test. If they knew that the pregnancy test any clinic or doctor would use is exactly the same as the one they could buy themselves at the drugstore, maybe some of them wouldn't go into those places to begin with (and those people hassle the women that turn out to not even BE pregnant, I assure you).
Planned Parenthood and other organizations should get the word out about that. Young, undereducated, and otherwise disadvantaged women are especially unlikely to be aware of this.