During a routine pre-employment drug screening, you collected a urine specimen from an applicant. After properly labeling the specimen, what is the MOST appropriate next step to ensure the integrity of the chain of custody?
Secure the specimen in a tamper-evident bag and store it in the designated secure area.
Put the specimen into the general refrigerator until the courier arrives.
Place the specimen on your desk while you complete the paperwork.
Ask a coworker to witness you placing the specimen in a regular plastic bag.