I figured I'd wait to see if anyone was actually sikh before flaunting my stupidity.
The question arose because of the struggle British authorities are having with the kirpan, a ceremonial dagger, which is a required object sikh men must carry as part of the faith. Clearly there are problems with legislation which forbids such objects as weapons.
My question was whether the blade itself has to be accessible. Having been 'stabbed'once by a fellah who failed to draw his knife effectively the thought occurred that the solution is a sheath which doesn't come off. The blade is still perfectly functional and ornate, and worthy of respect, but it's bound in solid ballistic nylon.