Even though the terminology directly states, "driving under the influence," many people believe that a DUI only applies to those who drink alcohol and then drive. The truth is that you can get a DUI for being under the influence of drugs as well. Those drugs may or may not be legally purchased.
One key thing to remember about a DUI is that an officer can give it to anyone who appears to be under the influence of medications, illicit drugs, alcohol or other chemicals. Drugged driving is harder to identify, but that doesn't mean that an officer won't try to stop you and arrest you for it.
Is there a separate charge for driving under the influence of drugs?
Not always. Sometimes, you'll end up with a DUI. Other times, you might get a DUID, which stands for driving under the influence of drugs. One important thing to remember is that a DUI isn't the only charge you could face. For example, you could also face charges for reckless driving if you were swerving in the road. You could face a drug charge if you're caught with illicit drugs. These are all important things to realize.
Florida does not have "per se" drugged driving laws, but many other states do. The good news about that is that there is no specific amount of a chemical that you cannot have in your body (related to drugs). What that means is that the officer can't charge you with a DUI for having marijuana come up on a test (though you could face a drug charge). However, laws constantly change, so your best bet is to stay quiet until you get legal advice.