The following excerpt is from International Association of Machinists and Aerospace Workers and District Lodge 147, National Association of Federal Correctional Workers v. Correctional Service Canada, Treasury Board and Don Graham, 2005 PSLRB 50 (CanLII):
In Almeida v. Treasury Board (supra), the custom inspectors wore union buttons with statements such as "KEEP OUT DRUGS & PORN" and "KEEP OUR CUSTOMS INSPECTORS". These buttons portrayed political statements. The customs inspectors, who are in constant contact with the general public, wore those buttons on their uniform. In this case, the correctional officers are not dealing with the general public. At the institutions referred to by the witnesses, a multitude of baseball caps are worn and management condones a lackadaisical approach to conformity in the correctional officer's uniform. It is for these reasons I do not believe this case applies.
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