"The ultimately standardless nature of the "undue burden" inquiry is a reflection of the underlying fact that the concept has no principled or coherent legal basis. As THE CHIEF JUSTICE points out, Roe's strict-scrutiny standard "at least had a recognized basis in constitutional law at the time Roe was decided," ante, at ____, while "[t]he same cannot be said for the 'undue burden' standard, which is created largely out of whole cloth by the authors of the joint opinion," ibid. The joint opinion is flatly wrong in asserting that "our jurisprudence relating to all liberties save perhaps abortion has recognized" the permissibility of laws that do not impose an "undue burden." Ante, at ____. It argues that the abortion right is similar to other rights in that a law "not designed to strike at the right itself, [but which] has the incidental effect of making it more difficult or more expensive to [exercise the right,]" is not invalid. Ante, at ____. I agree, indeed I have forcefully urged, that a law of general applicability which places only an incidental burden on a fundamental right does not infringe that right, see R.A.V. v. St. Paul, 505 U.S. ----, ----, --- S.Ct. ----, ----, --- L.Ed.2d ---- (1992) (slip op., at 11); Employment Division, Dept. of Human Resources of Ore. v. Smith, 494 U.S. 872, 878-882, 110 S.Ct. 1595, ----, 108 L.Ed.2d 876 (1990), but that principle does not establish the quite different (and quite dangerous) proposition that a law which directly regulates a fundamental right will not be found to violate the Constitution unless it imposes an "undue burden." It is that, of course, which is at issue here: Pennsylvania has consciously and directly regulated conduct that our cases have held is constitutionally protected. The appropriate analogy, therefore, is that of a state law requiring purchasers of religious books to endure a 24-hour waiting period, or to pay a nominal additional tax of 1¢. The joint opinion cannot possibly be correct in suggesting that we would uphold such legislation on the ground that it does not impose a "substantial obstacle" to the exercise of First Amendment rights. The "undue burden" standard is not at all the generally applicable principle the joint opinion pretends it to be; rather, it is a unique concept created specially for this case, to preserve some judicial foothold in this ill-gotten territory. In claiming otherwise, the three Justices show their willingness to place all constitutional rights at risk in an effort to preserve what they deem the "central holding in Roe," ante, at ____."