That's why you should never try to squat with a bar before you've mastered the bodyweight version with flawless form. (fitnessandpower.com)
As with any other style of training, the effectiveness of drop sets can be increased by completing full range of motion and maintaining flawless form. (fitnessandpower.com)
Typically a coach will have someone lift the bar without any plates at all until the student can do flawless form with their eyes closed. (scoobysworkshop.com)