If the test is simple, external, as in a breath analyzer then sure. If it involves needles then no. A physician should be able to look at someone and know if they are under the influence of something. Those people need to be fired as an example to everyone else.
Drugs have no place in a work environment.
Pot is legal up here and one day I went in to a Fido phone mart, the employee came out of the back smelling like pot and I left, never to return.

It completely depends on the job. Obviously I don't want my pilot to be stoned.
I don't care if the dude that made my pizza is high or not. Well actually, the pizza would probably be better if they're high!

But never random unless there's behavioral issues.

I totally support it

Support

I support it in industries that could be dangerous.

In the end it's an essential liability limitation measure.

I guess… but I draw the line at heroin 🤔

If the owners of the company make you take a test then they should also take a test.