â The presence of marijuana is detected by a drug test through the presence of the active chemical THC or Tetrahydrocannabinol. Technically, what is detected is known as THC-COOH (11-nor-delta-9-tetrahydrocannabinol-9-carboxylic acid).
1 Average Riding Instructor Salary: Independent riding instructors typically charge an hourly rate for services but on average earn about $35,000 to $39,000 per year.
Income. Starting salaries for trainee and assistant instructors can be between Â£12,000 and Â£17,000 a year. Experienced instructors can earn up to Â£25,000. Rates of pay depend upon the size of the centre, qualifications held, and whether accommodation, meals and further training are part of the salary.