I put your info, as best I could tell from the original post, into a blood alcohol calculator. It says:
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If you are male and weigh 190 pounds and you have consumed 5 Screwdriver(s) evenly over a period of 4 hour(s) then..Your estimated blood/breath alcohol concentration is .037%
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so unless you were drinking dry martinis, or I'm off on how long you were drinking, you miscounted the number of drinks. standard.
Blood alcohol calculator
call a cab.