Unique problem

Now here's a problem most libraries don't have to deal with every day.

We have run into a rather unusual problem with some overdue books. Some of our books that have been overdue for a long period of time have been housed where they were manufacturing methamphetamine. The local authorities are being very cooperative in assisting us with their retrieval, but we are concerned with contamination. Has anyone dealt with this problem before? What are the risks of the books having meth dust or other contaminates on them? What is the best way to clean the items when they are returned?
Yuma (CO) Public Library