The state courts were rather dismissive of his complaint. In turn, the Supreme Court was rather critical of North Carolina's dismissive attitude toward the Fourth Amendment. The state was inattentive to criminal law, and analyzed this claim as civil matter beyond the reach of the Fourth Amendment. But the Supremes would have none of that: "The State’s program is plainly designed to obtain information. And since it does so by physically intruding on a subject’s body, it effects a Fourth Amendment search."
The Court stops there, though, and remands to North Carolina to determine whether the statutory monitoring system -- the court-ordered GPS bracelet -- was reasonable under the Fourth Amendment.