Suboxone is a prescription opiate that has become a drug of choice in prison because it is easily converted to an orange-tinted paste, which is then smuggled in via the mails:
"We've had too many people dry the stuff onto the pages, then get a kid to color over it," said Capt. Mark James, who supervises the mail room, adding that Suboxone has at times been discovered on a daily basis.Smuggled Suboxone Bedevils Prison Authorities [nyt]...
In February, three coloring book pages, including two depicting Snow White and Cinderella, sent to a prisoner in the Cape May County jail, were splotched with the words "To Daddy" and an orange substance that turned out to be Suboxone.
OK...I don't know what's more ingenious...the person who came up with the idea of smuggling in this way, or the person who discovered it on a coloring book page.
It's clever, sure, but Suboxone is generally used for treatment of opioid addiction because it A)- doesn't do a very good job of getting you high and B)- contains an opioid-receptor blocker that prevents the user from getting high via other opiates.