Do All Drug Tests Test for Marijuana?

With more and more states across the country legalizing marijuana for both medical and recreational use, employers are becoming increasingly concerned how it will affect the workplace.

Three Major Concerns

Public Transportation

, perception, motor coordination, and attentiveness. School bus drivers and public bus drivers are responsible not only for the passengers they transport, but for the rest of the public as well.

A study by the National Highway Traffic Safety Administration concluded that drivers under the influence of marijuana involved in both lethal and non-lethal accidents increased considerably in Colorado since it was legalized in 2009.

Work Performance

Some jobs rely more on quantity than quality, such as somebody working on a conveyor belt as opposed to one who builds precision watches.


Working around or operating heavy machinery is dangerous for even the most sober and alert employee, but that danger can rise exponentially for somebody who is ‘high’ on the job.

Laws And Policies Governing Medical Marijuana Use While On The Job

Twenty-three states and the District of Columbia have legalized medical marijuana use, but the laws can be different from state to state. It’s very important for employers to know their own state laws in order to avoid any legal repercussions that may arise for illegally firing a medical marijuana employee.

In some of these states the employer can discipline or fire an employee if they test positive for marijuana, even if it was for medical use, and even if it was used away from their place of employment (on their own time). But with more states moving toward legalization, newer medical marijuana laws are being introduced to protect these employees.

Drug Tests That Will Detect Marijuana

There are several different types of drug tests on the market. With the advancement of technology, the best drug tests are capable of detecting marijuana, but not all of them. Check out our story about (home drug tests vs lab test Best for accuracy) For example, JDP offers urine, blood, hair, saliva, and breath testing. The employer should ask about the details of the particular type and/or brand of the test to be sure what kind of drugs it will identify.

Some of the tests include:


The most popular, but the person being tested usually must be monitored to prevent tampering.

Sweat and Saliva

Convenient and difficult to alter, these are being used more often.


Will give an accurate representation of the drug use, but can be expensive.


Shows a variety of drugs that were used, but depending on the length of the hair sample may not disclose the most recent use.


Although the use of marijuana in the workplace has been around for decades, certain accommodations for medical marijuana users have been in place since 2001. And since the number of people who believe recreational marijuana should be legalized is on the rise, so do the number of people who think that its use should have the same restrictions as alcohol.

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