Do you want to stop slicing? Then make sure that you transfer your weight to your FRONT foot.
One of the most common faults that cause a slice is keeping your weight on your back foot as to start your downswing and complete your followthrough. It stops your lower body from rotating. It causes you to slash across the ball creating massive amounts of side spin.
The simplest drill to perform is the ‘Gary Player-step through swing’. It makes sure that you commit to swinging all with way through the ball. And you can do on the range and the golf course during your round.