Thomas V. Mike Miller, Jr., P.A.

Call For A Free Consultation


Clinton: 301-856-3030

Dunkirk: 301-855-3100

Clinton: 301-856-3030

Dunkirk: 301-855-3100

Thomas V. Mike Miller, Jr., P.A. is here for you during this difficult time by continuing to remain open and fully functioning. Whether you’re having a personal injury, workers comp, family law, protective order, criminal law or traffic defense related issue, our attorneys are available by appointment, phone or video consultations to meet your needs. To schedule a consultation, please call our office at 301-856-3030 or contact us through our website and we will respond promptly.

Serving Our
Community Since 1967

It is critical to find a lawyer you can trust. One of Maryland's best-known attorneys and public servants, Mike
Miller has been active in Prince George's County and nearby communities for more than 50 years.

How long can drug tests really work?

On Behalf of | Feb 2, 2018 | Drug Charges |

You’re facing charges after failing a drug test, and you start wondering just how accurate those tests are. Can they really be trusted in such a serious case? How long do they work for, anyway?

It all depends what type of test was used. There are five main ones, each with their own useful time frames.

Saliva tests usually only work for a few hours. The longest they could produce accurate results is a couple of days after use.

Urine tests tend to work for the past seven days or so, depending on the drug in question. It is worth noting that some studies have produced results from usage in the previous 30 days or longer when it comes to marijuana.

Hair tests are less common, but they have a very long period of time during which they can produce results. They usually work for two to four months.

Sweat tests are also not used as frequently. The time frame for these tests is unclear, as subjects keep the patch on for a long time and simply wait to see if results are found. These tests also aren’t usually trusted by experts since there’s a very good chance that outside contaminants can ruin them, perhaps producing a false positive.

Typically, blood tests are considered the most accurate of the five kinds of tests. The window is also very small. They work for about 48 hours for most drugs.

Do you think your test fell outside of the acceptable window? For instance, maybe you were given a blood test a week after the alleged use, and now you’re wondering if that those test results can be trusted at all. If so, be sure you know what legal options you have.

Source: CRC Health, “Drug Tests Accuracy,” accessed Feb. 02, 2018


FindLaw Network
Attorney Image