Its important to raise awareness of this issue.
A relative of mine works as a speech therapist in public schools which are not local. At the start of every semester she gives all the details to her Rav, including amount & ages of the students in each group, who else has access to the room, windows in the room & in the door, whether the door is locked or not, etc.
A number of times the Rav has told her that she must rearrange the group or change rooms.
Many who work in these fields are unaware of the potential issurim that are involved. Always ask your Rav!