Rohypnol is odorless, colorless, and tasteless. Some people report a VERY slight bitterness to it, but it’s not extremely salty. At all. That’s why rapists use it.
THANK YOU. It’s true that some date-rape drugs have a taste to them–if your drink tastes off, stop drinking it. But it’s a much safer rule of thumb to assume that you wouldn’t be able to taste anything and keep your drink in your hand and under your eye at all times.