Which of the following substances is a common false positive for opioids?

Poppy seeds are a common source of false positives for opioids in drug screenings. This occurs because poppy seeds contain trace amounts of morphine and codeine, both of which are natural alkaloids found in the opium poppy. When consumed, even in small quantities, they can leak into the bloodstream and be detected during a urine drug test, leading to positive results for opioids.

This phenomenon has been documented in various studies showing that individuals who consume foods containing poppy seeds may test positive for these substances, despite having no illicit drug use.

In contrast, other substances listed do not typically result in a false positive for opioids. Coca tea contains alkaloids related to cocaine, while ketamine is an anesthetic drug that does not metabolize into opioid-like substances. Sertraline is an antidepressant that belongs to the selective serotonin reuptake inhibitor (SSRI) class and does not cause a false positive for opioids. Thus, while poppy seeds can directly lead to opioid detection in screenings, the other substances do not have this effect.