Information on drug testing programs for merchant mariners can be found in 46 CFR Part 16, which refers to the Department of Transportation's drug testing program in 49 CFR Part 40. It is not necessary to submit copies of the custody control, or laboratory forms. An original letter on company letterhead signed by a company official which indicates the applicant passed a test for dangerous drugs, meeting 46 CFR Part 16, within the previous 6 months. An original letter from an active duty military member's command indicating that the applicant has passed a chemical test for dangerous drugs within the past 12 months. Cardiac pacemaker implant.
Any cardiac surgery requires further evaluation.
Any other irregularity sufficient to compromise cardiac function. Hypertension - uncontrolled hypertension or hypertension controlled by medication requiring close monitoring. Tuberculosis or other active pulmonary disease. One episode of gastrointestinal bleeding in the past 6 months or 2 episodes in the past 2 years. Obesity sufficient to impair ordinary activity.