Which aspect of internal investigation has instigated the highest amount of litigation? Discuss

Drug testing is perhaps one of the aspects of internal investigation that has instigated the highest amount of litigation. Drug testing is mandatory for employees receiving federal funding under the federal Drug-Free Workplace Act. Yet, drug testing, in all cases, raises significant privacy issues. Promulgating, a reasonable policy, is one way to insulate an organization from liability.
The reason for drug test could be any of the following:
• Required by law in some industries
• Reasonable suspicion
• Random
• Prior history
• Work place accident