Can you tell us how toilets were policed before?
Or did a combination of women being able to leave or anyone seeing a male enter a female space, could get security or police, to assist them in removing a male from the toilets plus the societal norms which meant that only males who had ill intentions entered female spaces as all the rest, including males of all genders, respected that space being for female people only.
Why does this need to be 'policed' differently than it was 25 years ago.
'Policed' also means that if a male is using the space and they are an adult, 'policed' means they can be charged with an offence. So, again, the same as it was before some males claimed the privilege.
Right at this moment, women and girls who need these spaces to remain single sex, and I am glad to hear that this is not you, have no recourse unless they can prove a crime has been committed. Right at this moment, women and girls who need these spaces to remain single sex will self exclude from that space. And if no single sex space is available, they will self exclude from that area / activity.
Why do you think that this is the appropriate position for women and girls to be in?