Friel is meticulous and detailed, often focusing on the subtleties in personnel practices and sterility procedures in the pursuit of product safety and efficacy. His audits are comprehensive, covering each aspect of the drug manufacturing process from raw material handling to end-product testing.

Thomas Friel is an investigator with a sharp eye for sterility and contamination issues, particularly in drug manufacturing environments. He is known for his rigorous examination of personnel practices, raw materials handling, complaint handling, and sterility assurance methods, and is relentless in his pursuit of comprehensive sterility testing and adequate handling of raw materials. Friel's focus implies high regulatory compliance expectations and rigorous interpretation of CGMP (Current Good Manufacturing Practice) standards.