Rohypnol primarily comes in the form of an olive green pill with blue speckles at its core. It used to be a white tablet, but due to it being used as a date rape drug, these changes have been made so the blue interior can dye the light-colored drinks blue. Generic versions of the drug may not incorporate this precaution.

https://recoverypartnernetwork.com/drug/benzodiazepine/rohypnol-addiction-and-abuse