Drop Down Menus & Validation

[eluser]Kemik[/eluser]
Hello,

How is the best way of protecting data from being submitted using a drop down menu? I posted my site to be tested on PHP Freaks and found that by saving the source of files, they could edit the drop down menu values and then using their new html file to submit any value they liked using my drop down fields.

Could I just use normal rules like I do with text fields?