Balvir Singh Multani and his son, Gurbaj Singh Multani, are orthodox Sikhs. They believe that their religion requires them to wear a kirpan at all times. A kirpan is a metal dagger, which symbolizes virtue and honour.
Gurbaj was born in 1989 and attended École Sainte-Catherine-Labouré. One day in the schoolyard in November 2001, Gurbaj accidentally dropped the kirpan that he was wearing underneath his clothes. In this way, the school authorities became aware that he wore the kirpan daily. In December 2001, the school board, the Commission scolaire Marguerite-Bourgeoys ("Commission scolaire"), initially advised that Gurbaj could wear his kirpan to school provided that it was sealed inside his clothing. Gurbaj and his parents agreed to this.
The school board's decision was reversed in March 2002. After review, the Commission scolaire decided that Gurbaj could not wear the kirpan to school, no matter how it was secured. The Commission scolaire viewed the kirpan as...

