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.
Salary by Experience. Like with many other professions, your salary can increase with the number of years you work in the industry. According to PayScale.com in September 2015, motorcycle mechanics with 0-5 years of experience earned a rate of $29,000 a year. Those with 5-10 years of experience earned $35,000 a year.