This isn't really a forum where people try and get one over on each other, it's to help us all.
Law 14 says:
- If, before the ball is in play, one of the following occurs:
the player taking the penalty kick or a team-mate offends:
- if the ball enters the goal, the kick is retaken
- if the ball does not enter the goal, the referee stops play and restarts with an indirect free kick
- except for the following when play will be stopped and restarted with an indirect free kick, regardless of whether or not a goal is scored:
- a penalty kick is kicked backwards
- a team-mate of the identified kicker takes the kick; the referee cautions the player who took the kick
- feinting to kick the ball once the kicker has completed the run-up (feinting in the run-up is permitted); the referee cautions the kicker
There's a handy table on the
IFAB Laws page too, which covers the determined outcomes. The debate is always around levels of tolerance/expectation in terms of when to apply these.