That is an absolutely terrible way to administrate. You should always talk to a player and make sure they understand what they did to break what ever rule you are warning them for. How can you expect a player to learn from his mistakes if he doesn't understand what he did in the first place. If lets say you have a newer player who has just started playing gmod/darkrp, you join ZARP and a couple minutes into playing he break a rule. He is then blindly warned for it, but no admin ever shows up to tell him why, he cannot really know exactly what he did wrong. While he could make an <em>assumption</em> about why he received the warning based off the reason provided, but he will never be 100% certain. Because the admin was to lazy to take two minutes out of his day to make sure he understood what he did and why it was wrong.

Its the same thing has banning without talking to the banee. They will learn nothing via the ban screen and the only way you turn a minge into a regular player is by working with them.

I do however agree with Keith that you can warn someone without a sit if they are doing the exact exact same thing.

As for the rules thing, if something is not stated in the rules you cannot warn for it. That again is a terible way to administrate. How is it fair to punish a player for doing something they could not possibly know was wrong?