Trevor Hall is the co-founder of Hall & Angus, a CPD-accredited consultancy and training provider specializing in workplace substance misuse management. Trevor has over 50 years' experience in substance misuse management and the enforcement of law in the area. In that capacity he has reviewed hundreds of workplace substance misuse policies and has written hundreds of policies across numerous countries. He also designed and built a 10,000-sq. ft. UKAS accredited workplace-dedicated toxicology lab. Many of the principles applied globally are exhibited in the book and have been tried and tested by Trevor over the last 25 years in many sectors of commerce and industry.