Cautioned for possession of a class-A drug.

因持有 A 类药物而受到警告。

So man with a previous conviction of supplying class A drugs?

所以说他曾因供应A类毒品被定罪?

We grow opium poppies, which can be used to make a class A drug, which is heroin.

我们种鸦片罂粟，它可以用来制造甲类毒品，也就是海洛因。