Your spouse works at a middle school and reports rumors

Your spouse works at a middle school and reports rumors of a teacher, Zane Wilkins, molesting some students and taking illicit pictures of them. Zane allegedly viewed these pictures in his office. Your spouse wants you to take a disk image of Zane's computer and find out whether the rumors are true. Write a report outlining how you would tell your spouse and school administrators to proceed. Also, explain why walking into Zane's office to acquire a disk image wouldn't preserve the integrity of the evidence.