While the provided documents do not directly address whether drug testing is considered an inspection, they do outline various aspects of workplace inspections and investigative techniques that may be relevant. Inspections typically involve examining records, questioning employers and employees, taking samples, and using other investigative techniques 2, 3, 4, 7. If drug testing is part of a broader investigation into workplace safety or health hazards, it could potentially be considered an investigative technique used during an inspection 2, 3, 7.

However, it's important to note that the documents also emphasize the need to comply with safety and health rules, avoid unreasonable disruption of the workplace, and respect employee rights during inspections 2, 3. Therefore, if drug testing is conducted, it should be done in a manner that adheres to these principles and any applicable legal requirements.