Can blood tests detect drug use?

The harm of drug abuse to individuals, families and society is immeasurable. There are many ways to detect drug abuse, such as hair testing, drug paper testing, blood tests, etc. Blood tests can detect drug use within the past two years, but not every office has this equipment, so it is not common in society. Another disadvantage is that it can only detect whether there are chemical components of drugs in the blood, but it has no ability to detect the number of times and duration of drug use.

The answer is yes, it can be detected through blood tests. Mass spectrometry is a common blood test for drugs. Simply put, mass spectrometry is a specialized technology that identifies compounds (drugs) by preparing, separating, and detecting gas-phase ions. But we must be clear that this detection method is rarely used by us.

Because this blood testing method is relatively expensive and not many places have such equipment, it is not universal. It is mostly used in chemical research; it is used in public security investigations (to determine whether a person has taken drugs); and blood tests are used to confirm the positive result of urine drug tests due to cross-reactions caused by taking multiple drugs.

Blood tests can generally detect whether a person has used drugs within 1 to 2 years before the test. In fact, it is to detect whether there are drug chemicals in the blood, so as to determine whether a person has used drugs. The disadvantage is that it is impossible to determine when the drug addict took drugs, nor is it possible to determine how many times he took drugs in 1 to 2 years.

Drug detection methods

Hair test: After a person injects or takes drugs, in addition to urine, other substances such as hair, sweat, feces, tears, nails, etc. will more or less contain the drugs that have been used or their metabolites, and therefore can be used as evidence for drug detection. As long as the hair is not cut, it can fully present the subject's drug use history in the past few months, and is considered one of the most effective methods currently.

Special drug test strips, drop 2-3 drops of urine into the test strip hole, the result will be available in 2-3 minutes, 1 red line means drug use, 2 red lines means no drug use

The facial expression of drug addicts is listless, with pale lips, skinny body, and dark circles under their eyes (long-term drug addiction leads to lack of sleep). They usually have pinholes on their elbows and backs of their hands.