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Alprazolam may be quantified in blood or plasma to confirm a diagnosis of poisoning in hospitalized patients, provide evidence in an impaired driving arrest, or to assist in a medicolegal death investigation. Blood or plasma alprazolam concentrations are usually in a range of 10–100 μg/L in persons receiving the drug therapeutically, 100–300 μg/L in those arrested for impaired driving, and 300–2000 μg/L in victims of acute overdosage. Most commercial immunoassays for the benzodiazepine class of drugs cross-react with alprazolam, but confirmation and quantitation is usually performed using chromatographic techniques.   
I think it is great people are concerned about such things, what I don’t get is if so many people are concerned, why they cannot donate to third party research to verify testing results and safety instead of throwing out more garble that just confuses the subject. Your article was great retoric, but has no substantial value, no supporting data, no specifics indicating who or when anything was deemed safe. Componds broken down are always poisonous. Chlorine has several forms, table salt is made up of two substances that can kill you and itself is dangerous, but also required for life. Water kills more people than most substances, yet no one complains about water. I believe articles like these are the reason we live in an uneducated/mock educated society where we blindly follow sci-fi beliefs instead of seeking scientific evidence.