Only if they are rubber.

Dear Is Mise,

Kirpans can be pointed, curved, blunt or sharp.
They can be from 3 inches to 9 inches in size.
I still think that children should not bring
them to school.

These kirpans are usually razor sharp and curved for a quick slice of flesh.
If they are purely for ceremonial use there is no need for them to be sharp or have a serious point.

I don't have a problem with Sikhs possessing and carrying the kirpan as a distinguishing mark of the Sikh Khalsa. They are, after all said and done a very proud, warrior race of people and in my time it would be very rare indeed to hear of any Sikh misuse or carry out an illegal act with this symbolic dagger. Reckon we've got more to concern ourselves with, than the law abiding Sikhs!

Ultimately this gets down to the multicultural argument.
The law says you cannot carry a knife in public places.
Chefs have many times had some explaining to do when traveling.

The only real problem that I see is someone pretending to be a Sikh.
If you were an airline steward, what would you feel about it ?
The sikhs seem to be adopting a realistic attitude, putting it into
checked in baggage, but it might give the scanners some pause for thought.

Bazz,

The law doesn't say that you cannot carry a knife in a public place, what it does say is that you must have a legitimate reason for doing so.

I, and many of my friends, frequently carry knives in public places, in plain view and none of us has ever had one objection raised.