Can electronic devices be searched without a warrant?

The court in Riley, supra, 134 S.Ct. 2473 did not hold that electronic devices are immune from search, but only that they cannot be searched incident to lawful arrest as an ordinary exception to the warrant requirement. We are not concerned here with such exception to the warrant clause. Here we deal with the application of probation conditions which may lawfully be used to restrict the exercise of constitutional rights of persons convicted of crime and who must be supervised for the rehabilitation and prevention of crime. (United States v. Knights (2001) 534 U.S. 112, 119.)