Arizona police tweeted an unusual warning to parents shopping for back to school supplies -- pieces of drug paraphernalia are not required for chemistry class.

The Gilbert Police Department tweeted a photo showing items of drug paraphernalia including marijuana pipes, bongs and glass crack pipes.

"If your kid tells you they need any of these items for chemistry class, they are lying #BackToSchoolShopping #IDontThinkSo #ThursdayThoughts," the tweet read.

The tweet quickly went viral on the microblogging site, earning lauds from other police departments.