<prompt> Widmarks formula helps in the measurement of the blood level of -CocaineAlcoholBarbituratesBenzodiazepines  <response>: The basis for calculating the approximate quantity of alcohol in the body, after equilibrium between the blood and the tissues has been reached, is expressed by the Widmarks formulaa p.r.c.a-Weight of alcohol in g in bodyp- the weight of the body in kgc- concentration of alcohol in blood in gkgr- a constant obtained by dividing the average concentration of alcohol in the body by the average concentration ofalcohol in the blood 0.085 for men, 0.055 for womenFor urine, formula is- a34 p.r.q., where q - concentration of alcohol in urine in mgkg 