Which U.S. law requires federal contractors to maintain a drug-free workplace for contracts of $100,000 or more?

The Drug-Free Workplace Act is the correct choice because it specifically mandates that federal contractors must maintain a drug-free environment for any contract valued at $100,000 or more. This act was enacted to promote safety and productivity in the workplace and aims to prevent drug abuse among employees who are engaged in federal contracts.

Under this law, contractors are required to inform their employees about the dangers of drug abuse in the workplace, establish a policy prohibiting the unlawful use of drugs, and implement a drug testing program. This comprehensive approach helps ensure a safe and productive work environment, which is particularly crucial in positions that are funded by taxpayer dollars.

The other options do not pertain specifically to federal contractors or the requirement regarding drug-free workplaces. The Substance Abuse Act primarily focuses on treatment and prevention of substance abuse rather than the specific requirements for contractors. Workplace Safety Laws encompass a broader range of regulations aimed at ensuring safe working conditions but do not specifically address drug-free policies. Lastly, the Federal Employment Standards Act is not a recognized law and does not pertain to maintaining a drug-free workplace.