The worst reading is you were drunk, your boss had you drive him home, and at some point he discovered evidence of you drinking in your car, presumably at work/on the way to work/whatever.
The other (better) reading is you were drunk at work at some other time, today you had to drive your boss home, and he found gin in your car which he took as evidence you are still drinking at work, possibly even while driving. Although alcohol is legal and the mere presence of it in a private vehicle doesn't mean anything illegal or against work rules occurred. Which is why I assume this was a follow up event to the first statement. I'm probably reading too much into it
I'm confused about the order of events here.
The worst reading is you were drunk, your boss had you drive him home, and at some point he discovered evidence of you drinking in your car, presumably at work/on the way to work/whatever.
The other (better) reading is you were drunk at work at some other time, today you had to drive your boss home, and he found gin in your car which he took as evidence you are still drinking at work, possibly even while driving. Although alcohol is legal and the mere presence of it in a private vehicle doesn't mean anything illegal or against work rules occurred. Which is why I assume this was a follow up event to the first statement. I'm probably reading too much into it