Dr. Walter Block made waves recently with his claim that stop-and-frisk policing is compatible with libertarianism. On the surface, the claim seems entirely lunatic; surely Judge Napolitano is correct when he labels it the act of "an authoritarian police state." One thing I’ve learned over the years, though, is that, while one may not always agree with Dr. Block, it is always and everywhere a mistake to disregard him. If Dr. Block thinks a thing, it should be regarded as a position reasonable people may hold, and this is no exception. So we can stipulate that it’s reasonable, but is it correct?
First, we should dispense with the case of private police. If the police are entirely private, operating on private property, then there is clearly no libertarian case to be made against stop-and-frisk. If it is my property, I can set whatever conditions I desire on its occupancy, and that includes submission to random pat-downs. If you don’t wish to submit to my stop-and-frisky police, then your solution is simple: leave (or do not enter) my property. Is this "authoritarian?" Perhaps, but it should be noted that a proper libertarian society would permit such pockets of authoritarianism as long as the authoritarians restrict themselves to being authoritarian over their own property.
That aside, we turn to the more difficult question: can a libertarian support a stop-and-frisk policy among government police in a non-libertarian world? It seems difficult to see how, but Dr. Block provides the following argument, after "stipulating that the purpose is not to stop victimless crimes like drug selling, but, rather, crimes with victims such as rape, murder, theft, etc.:"