[laboratorymice]

Don't mean to take a side here, but just because a rule sounds hard to enforce doesn't mean it doesn't have an effect in practice. People will often change their behaviour out of sheer societal pressure if something is explicitly banned, even if the ban is not enforceable. Saying "our society does not want/accept this" already accomplishes something, regardless of enforcement. An example would be the banned disposal of certain substances in residential solid waste or sewage systems.