Well, as I responded earlier to another question, there are three methods of doing it. Essentially the system is that once the board receives an application for certification, it conducts a preliminary investigation to ensure that the people whose cards are submitted, for example, really did sign those cards. They conduct an investigation as to the actual size of the bargaining unit and how many people are in it in order to determine the voting requirements. Then, based on their assessment of the type of workplace and which ballot or voting method is best suited, they'll choose an on-site method, a mail-in, or an electronic version. On site, as one of the witnesses mentioned, takes place typically in the employer's premises, and depending on the size, there may be one or several voting booths. There's an official there supervising it to ensure that privacy is ensured. Employees are given a good length of time to show up during the day. Sometimes in large workplaces it can be held over several days as well.
On February 11th, 2014. See this statement in context.