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 Bureau of Labor Statistics reports that the median annual wage of a fitness instructor is $31,090 as of May 2010. This amounts to just a little less than $15 per hour. BLS does not distinguish between the salary of a Zumba instructor when compared to that of other fitness professionals.