How can you help a compulsive liar?
Get him/her to a psychologistor you can try some self-help stuff: http://www.uncommonhelp.me/articles/how-to-stop-compulsive-lying-disorder/There are also support groups for compulsive lying on the net. Good luck!
very difficult to stop unless appropriate punishment which will make remember what is doing is not correct is imposed
Lie to them.