OSHA sought eight warrants in 15 years to inspect Nabors sites. None of those inspections was related to a worker's death, but three times in 2006, workers complained to OSHA about safety conditions on Nabors sites, telling of greasy floors, workers not wearing fall protection and supervisors sleeping on the job. In one of the complaints, a worker said a supervisor "threatened physical violence against an employee who raised safety concerns," according to a copy of the complaint filed with a warrant application.