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.
How much does a Fitness Instructor make? The median annual Fitness Instructor salary is $42,500, as of March 31, 2017, with a range usually between $33,726-$63,085, however this can vary widely depending on a variety of factors.