Does anyone kowns the answer to theses questions? any will do

The handling and movement of controlled substances is Regulated by the DEA (Drug enforcement administration)
One of the main task of the drug enforcement administration is to combating drug smuggling and use within the United states. Hope this helps

he forgot to adjust the brightness and the curtain. Slowly move the knob so that the objective goes up. Continue until the image is okay

Pretty clear focus. Then use the knob, if available, for a clearer picture. If you are on a microscope with a moving specimen carrier, turn the coarse knob so that the table carrying the specimen moves down or away from the objective. This is exactly how to use a microscope focus regulator.

Explanation: