NAIL (North American Independent Laboratories) is a not-for-profit organization dedicated to the development of uniformity and setting standards in testing, working in close association with ASTM and ANSI. To maintain accreditation, regular audits are conducted to ensure all industry accepted standards are strictly adhered to, including review of operational areas including but not limited to laboratory facility, equipment, training and knowledge of staff, quality control work procedures, and financial responsibility. Independent test facilities operating without NAIL-accreditation are not monitored to ensure industry best practices and standards are followed.

Lineman's Testing Laboratories is home to Canada's largest NAIL-accredited testing facilities.