Adv dupe 2 bug

So my server runs adv dupe 2 and people are able to make things in single player and bring them to my server. People are making blocks with trails and trails is banned via tool restriction but since they do it in single player they bypass it.

I also believe this is another adv dupe 2 single player to multi player bug:

The sky just fucking up its kind of funny I have to admit, but I really don’t want this on my server.

Is there a way I can stop this?

Don’t host a darkrp server.

Just automatically delete any instances of env_spritetrail