Can cocaine be dissolved in a hot drink given to a person and the person not know that she was drinking the coffee with cocaine in it?

Cocaine will numb your mouth. The smaller the amount that was in, the less your tongue will feel numb. If there is a lot it in, your tongue will feel really numb. Also it has a very distinct taste, but you may not notice it so much if there isn't much mixed into the coffee.

You probably wouldn't notice the effects of cocaine because it was mixed in coffee. Cocaine is like coffee times 10 even in smaller amounts. You would feel a huge surge of energy, like you want to clean house, and then feel really nervous, like you're being watched and they're out to get you. You would also have trouble falling asleep even though you will feel tired after quite some time.