People will find a way to cheat if they make up their minds to take advantage of the system. Making it harder to cheat could cut back on the activity, but it will never eliminate it.
What must be weighed is the effort put into changing the system versus the benefit. I don't have experience with that type of coding, but if some of you are serious about coming up with a solution you could offer your services to help recode the system. This would lower the amount of effort by the administration and, therefore, make the cost benefit analysis more appealing in favor of changing the system.
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