Some drugs aren't eliminated by urine, or aren't eliminated as an the active drug. Some transformations (metabolize) can change drug configuration and make it untraceable as the active drug in urine. You should dose the metabolite if you wanna trace it.
Blood and urine are drawn during the autopsy and sent to the lab for toxicology reports.
An autopsy IS done when people die in car accidents unless the accident was un-witnessed. The reason is because the person investigating the death (medical examiner) has to know if the undividual was under the influence of alcohol and other drugs. This is tested in the blood and urine.
If you search the internet you'll find out that drugs stays longer in The urine Tham blood.
Drugs, Urine Drugs, Urine
During autopsy, the medical examiner will sample blood,urine, or hair follicles to determine the amount of drugs in the body. Certain levels can be deemed as accidental, while higher levels are deemed intentional overdoses. The drug taken to cause death is also taken into account (morphine, oxycontin,etc).
its checks blood and urine for existence of drugs. sometimes stomachs, sweat, or salvia are checked.
Urine, blood and hair are commonly tested for drugs.
Drugs show up in urine longer than in blood. When ingested, the drugs are metabolized and to complete the circuit through the liver and kidneys and then excreted. The process of elimination is longer than the time to circulate the blood.
Some are, but urine samples are more common.
5 days??
urine test during menstruation reveal presence of blood in urine and red blood cells
If I understand the question if the blood has drugs so will the urine. If you are trying to switch samples that will just get you into more problems.