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.
In the United States, a driver with a 0.08 blood alcohol concentration (BAC) is legally defined as drunk. But even at 0.02 BAC, your abilities to track a moving target and perform two tasks at the same time can be impaired. At 0.05 BAC (about 2.5 drinks in one hour), you can lose some small-muscle control (such as the ability to focus your eyes) and take longer to respond to emergencies.