Case of crossed wires?
2 primary drugs of use and / or abuse with the same street name, albeit with a bias depending on which side of the pond they are used (I imagine more UK residents take it firstly as referring to methadone which is relatively prevalent due to ease of treatment access, and speed in the US where m-amp appears to be as prevalent as any street drug.)
When mephedrone became headline news in the UK while still legally available, it to was often referred to as meph but even despite the distinct spelling compared to the first two examples, it did not help the nitwits in charge of our drug policy know what drug they were referring to.
As the national press added to the hysteria that quickly got the substance banned, it cited 2 cases where the drug was involved n fatalities, sad scare stories of young people's lives cut short, reminiscent of the MDMA witch hunt of the '90s.
So, with the governments work done and the streets safe from this menace that had, at the point of prohibition, allegedly been involved in 2 deaths despite hundreds of thousands of users, it came to light that both fatalities were as a result of overdoses from the use of unprescribed methadone, taken by the young men in conjunction with alcohol, an opioid that due to its widespread prescription and use among drug users kills about as many people in the UK as heroin. Of course, by that point no body was interested any more, as I doubt the readers of this post are at this point.
Confusion does abound when discussing methy - named drugs though.