I "invented" a new drill to stop slicing and start drawing. At least I've never heard of it before and it came out of my own head.
The basic idea is the think of your swing though the ball like a clock lying face up on the ground. 12:00 is straight through the ball, 11 is a fade, 1 is a draw. Now grab a plastic range bucket. Place this bucket in line with what would be 1:00 about 5 or 6 feet out in front of you on the grass or whatever. Set up to hit down the line, dead on noontime with your stance and the clubface, might actually feel like the face is closed to us slice prone players. Just take a normal swing but take the club down inline with that bucket at 1:00. I guarantee if you get this correct you will start hitting it straighter and a draw once the correct release is applied.