<prompt> Widmarks formula helps in the measurement of blood level of -CocaineAlcoholBarbituratesBenzodiazepines  <response>: The Widmark formula is provided in equation is a cpr. Where a amount of alcohol in grams absorbed in body, c concentration of alcohol in blood in gramskg, p weight of person in kilogram and r constant. In men, the constant is 0.68 and in women it is 0.55. For urine analysis, the formula is a 34 qpr. The other factors are same and q concentration of alcohol in urine in gramsliter. REF;THE SYNOPSIS OF FORENSIC MEDICINE:KS NARAYANA REDDY;28th EDITION;PAGE NO 330 