The best way to keep kids from cussing is to stop the behavior before it becomes a problem.
I asked him why he didn't answer his cell and he went nuts, cussing and telling me that his phone was his personal business and he didn't have to always answer it.
A trip to the mall, a visit to the park and even the halls of schools have been filled with numerous *&^%$ examples of kids cussing.
Though parents may have strict rules against cussing at home, theses rules may not influence kids when they aren't supervised.
Some people may feel that cussing is something their children can do that they feel "safe" about.