"The challenge with plexiglass walls, if they're not being implemented very selectively, is that they actually can impede ventilation if the air can't circulate well," Juni told CBC News.

Not all Republican lawmakers are on board, making it more uncertain ... The company submitted a design for a wall made of wire and plexiglass that would work similarly to a one-way mirror.

Plexiglass alone won’t be enough to keep the debates safe. Two, five-foot tall plexiglass walls will stand between Vice President Mike Pence and Senator Kamala Harris at Wednesday night’s debate.