Wheel rebuilding. Is it ok to reuse spokes?

The last word on reusing spokes is Roger Musson. From an earlier posting here:

PS If it were a wheel previously built by myself then I would always re-use the spokes but as Zippie says, it takes a little longer so for commercial reasons I normally cut them out. If you have no commercial pressure and the lengths are appropriate then why not reuse them. The spokes have been operating well below their yield stress and fatigue limits and will be in perfect condition. I think it's important that you only re-use spoke from a previous build done by yourself, that way you know the history and can be confident they will perform just as well.

I've got his book and I think it's outstanding.

DoctorBike