A heartbeat bill is an anti-abortion legislation in the United States that makes abortion illegal as soon as the embryonic or foetal heartbeat is detectable. North Dakota became the first state to pass this law. It was later held as unconstitutional under the precedent set by the US Supreme Court decision in 1973. A new heartbeat bill was recently passed by Texas. This law would ban abortion after as early as 6 weeks – before many women even know they are pregnant.