The state of Minnesota had a parental notification law which was in place in 1981, challenged in 1986, suspended, and then reinstituted.
The number of abortions dropped 34% while the law was in place, the number of pregnancies in the age group dropped 27%
“Impact of MN Parental Notification Law on Abortion and Birth” J. Rogers, et al., American Journal of Public health, March 1991, volume 81, number 3, P294
Perhaps when teenagers realize that abortion is not such an easy option, they are more diligent at using contraception are practicing abstinence. The fact that both the abortion rate and the pregnancy rate went down seems to indicate that when parental consent laws are in place, teens will do more to avoid pregnancy.
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