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This type of drink was recently banned at a federal level due to it's dangerous health effects.
Caffeinated Alcoholic Energy drinks (eg. 4 Loko, Joose, Sparks, Vodka Bull, Jägerbomb, Rockstar 21). Through separate mechanisms, energy drinks act as stimulants, and alcohol as depressants. Mixing a depressant with a stimulant sends mixed signals to the nervous system and can cause cardiac problems such as heart arrhythmia.