There are two differing issues.
Firstly, the server admins are able to disable the use of mods on their server if they wish, which was introduced in 1.0.3 to prevent people using mods to cheat on servers. This protection can be disabled however, so mods would be allowed on a biohazard server if you set one up.
Secondly, most servers will install the mods for you via MTA's scripting system. These are mods which the server has authorised already and will be forced on all clients.
darkdreamingdan
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