DOVER, Del. – Delaware lawmakers have introduced new legislation to ban Tianeptine, a chemical found in what’s known as “gas station heroin.”. “Gas station heroin” and the chemical found in it are being sold under the false pretense that it acts as a dietary supplement or an antidepressant, but in actuality it induces an opioid-like effect to those who consume it, causing dangerous and potentially life-threatening side-effects in some cases.