The head of the Federal Bureau of Investigation insisted on Thursday that it will not set a precedent if Apple assists authorities with breaking into an iPhone 5C, and that the software would not be reusable.

“What the experts have told me is that the combination … of a 5C and this particular operating system is sufficiently unusual that it’s unlikely to be a trailblazer, because of technology being the limiting principle,” FBI Director James Comey told a panel of the House Intelligence Committee.