drug testing by police, proper procedure, and who is qualiflied to proform the test?

Answer 1

Place a smal of amount of the suspected drug into the package. Break the vials. Shake the package. Check the color the liquid turns to the corresponding drug from the chart on the box. It's not rocket science. It's a field test. Only qualification is to be able to read. It's enough to charge someone.

For court, I send the suspected drug (anything but pot) down to the state crime lab for testing by a certified chemist.

Answer 2

Depends on the laws of your country, and you didn't tell us where you are.

Richard