The employer can test for alcohol by breathalyzer if they have reason to believe the employee is intoxicated on alcohol. Other than that, WA law allows for testing of their employees for drugs
Wash. Rev. Code §49.82.010
Private employers who want a discount on their workers' compensation premiums may test applicants if advance notice has been given and a job has been offered. Employees may be tested upon reasonable suspicion of drug abuse, following a workplace accident, or at random. Employer must post testing policy and must offer an employee-assistance program to employees who test positive before terminating them. Employers can terminate employees who have a second confirmed positive test or refuse to participate in the employee-assistance program. Employees have the right to explain or contest the results. Random testing is allowed. Results are confidential and cannot be used in a criminal proceeding.
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