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The level of probenecid in Rob’s system was equivalent to 1 kernel of rice in a bag among thousands,” Kiernan wrote.

Roberts tested positive for probenecid, a masking agent.

The pharmacist, it turns out, had sold him empty gelatin capsules but used a pill-counter contaminated from selling probenecid to a previous customer.

Another drug, probenecid, helps the kidneys excrete uric acid.

Her stepfather took her to a rural pharmacist, who sold her an obsolete medicine called moxylong, which contains probenecid.