How many people buy marijuana in this country?? Law enforcement typically focuses on sellers, not buyers.
You can't debunk a lie with a bigger lie.
Oxycontin use, possession, purchase or sale is illegal except when taken under the advice and supervision of a licensed medical doctor.
There are people going to jail for long terms for illegal trafficking of this specific drug.
If you are curious to learn facts, just enter "oxycontin arrest" into google and open your eyes.