Is it true that GHB (The "Date Rape" drug) is being sold among inmates in correctional facilities?

The prevalence of GHB is on the rise in unlikely/unsuspected suburban locations. Another unsuspected location is prison- with drug sales rampant in many prisons- it has become known that the Correction Officers have been the source of these illegal sales. Does anyone have any information or knowledge regarding the sale/use/abuse/etc. of GHB?

: http://alcoholdrugstreatment.info/is-it-true-that-ghb-the-date-rape-drug-is-being-sold-among-inmates-in-correctional-facilities