I work for an engineering company in Denver. They did not require a drug test upon hiring and I have never taken a drug test specifically for the company itself. They don't even have a drug policy.

The only drug test I have been required to take was when our company won a contract and the owner of that contract required drug testing for any employee who worked on that specific project. The contract owner had a drug policy and everybody working on that project had to comply.

Good luck in your search!