IMPORTANT POINTS

• The Percentage of blood alcohol in the stage of "dead drunk" is 0.5%.
• Fatal period of Datura poisoning is 24 hours.
• While dispatching blood and urine for chemical analysis, sodium fluoride is added as preservative in concentration of 50 mg/10ml.
• Critical level of alcohol in blood is 0.15%.
• Gas rigidity appears after 72 hours.
• Ratio between ethyl alcohol in blood to urine is 1:1.33.
• Fatal dose of opium is 2 gm.
• Fatal period of sulphuric acid poisoning is 18-24 hours.
• After death, benzidine test is positive upto 150 years. Bones begin to decompose after death in 3-10 years.
•  In poisoning by salicylates, the Gastric lavage is useful upto 24 hours. 
• Physostigmine can be regarded as the specific antidote of Datura.
• Copper sulphate is used as an antidote to phsophorus.
• Haemorrhagic spots are found in poisoning by thallium.
• Amyl nitrate is antidote of cocaine poisoning.
• In sea water drowning, there is steep rise in Na+ and Mg++.
• In methyl alcohol poisoning treatment recommended is ethyl alcohol and sodium bicarbonate.