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.
The U.S. Bureau of Labor Statistics includes golf teaching professionals under Sports Instructors within the Coaches and Scouts category. They earned average annual salaries of $36,680 as of May 2012, according to the BLS. The top 10 percent made more than $65,910 per year.