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 average annual salary for a teen certified driving instructor was $41,000 as of 2013, according to the job site Indeed. This equates to $19.17 per hour, based on a 40-hour workweek. The minimum educational requirement for this job is a high school diploma.