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Yes, they typically take long, in tv serials they are interpreted in warp speed while in reality they can take from weeks to months.
Getting a complete and accurate forensic toxicology test result can be a lengthy process for a variety of reasons.
First of all the samples are not only collected from blood, urine and body fluids but various organs from autopsy like the liver, lung
, brain, vitreous of the eye etc are also collected. A complete record is formulated and these are sent in specially containers to the lab and forensic toxicologists and pathologist for tests to be run.
Since, there may be a lot of specimens that need to be tested, which means more testing time. And as an investigation proceeds, information about the possibility of another drug being involved may surface, so even more testing may be needed.
When the first round of positive tests have to be confirmed by the more sophisticated method, this may require sending out the specimens to more specialized laboratories. And that adds to the delay. 6 to 8 weeks is pretty standard and can take more than that as well in complicated cases.
It is possible that your mother since you stated was an alcoholic and had not had a drink in over a week, was suffering from alcohol withdrawal. A condition that is characterized by seizures, hallucinations, shaking, sweating, nausea, agitation, headaches and confusion.
Her boyfriend or someone who was with her at the time can confirm if she had those symptoms prior to the fall.
When she fell she could have had a concussion and a internal hemorrhage in the brain, such an injury can take a few minutes before the person finally goes in to coma or gets unconscious.
Sometimes, the person can faint in the first instance but get up and start walking and be normal for a while, even for a few hours before finally getting in to coma. This is known as a Lucid interval and is indicative of an epidural hemorrhage or hematoma.
A lucid interval can be seen in the post ictal phase of seizures (after a seizure) and heat strokes as well and is not specific to traumatic brain injury only, so this could have been the case and the alcohol withdrawal symptoms and a seizure, then the fall and lucid interval could be the explanation.
I understand how you feel because I lost my mother a few years back and yes, it is hard to accept the reality especially when the cause of death is sudden and unnatural but by personal experience, it is best to let go and come to terms with it. Being a doctor I know that there are a lot of ways to go - some worse than others and one should thank the Higher Power for not taking away a loved one in a grave manner and granting us the opportunity to say our final good byes to the departed at their funerals.
Hope this helps.
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