Best Answer: Generally speaking 15 - 20 drops = 1 mL. So, about 4 to 5 drops should approximate 0.25 mL. However, this is only a guesstimate since there are many factors that contribute to this, including: viscosity of the liquid, dropper size, etc... To measure 0.25 mL more accurately, I would suggest drawing up the liquid into an oral syringe.
What is the legal limit for alcohol and driving? Every state in the US sets the legal limit for blood alcohol content, or BAC, at .08%. This means that if your blood alcohol level is above .08%, you can be arrested in any state in the United States and charged with DUI.
1 Alcohol related fatalities account for 39% of all traffic fatalities. 2  The average BAC among fatally injured drunk drivers is .16%, or twice the legal limit.  The risk of death for drivers in single vehicle crashes with an elevated blood alcohol concentration is 385 times that of a zero BAC driver.