You can find amphetamines at pharmacies in the USA under the brands: Adderall, Dexedrine, Dextrostat, Desoxyn, Didrex, ProCentra, and Vyvanse.
In addition, the article doesn't say they are specifically going to use Meth, only amphetamine.
http://www.tandfonline.com/doi/abs/10.1080/02791072.2008.104...
http://psycnet.apa.org/psycinfo/1987-01824-001
You can find amphetamines at pharmacies in the USA under the brands: Adderall, Dexedrine, Dextrostat, Desoxyn, Didrex, ProCentra, and Vyvanse.
In addition, the article doesn't say they are specifically going to use Meth, only amphetamine.