Many a truth in jest. This sums up my view. If you're discreet with the knife or multitool and don't give anyone a reason to be concerned then it would take a police officer with x-ray vision to see it and ping you for carrying it. My habit is to carry an opinel knife in my rucksack on walks. I even carry it like that around town before or after the walk. Town being Ambleside or Keswick near where I'm walking. Now I just look like a walker, which is what I am. If I got searched then I have food with me or did have food. The knife is to cut food. Tupperware box with the remains of lunch justifies the knife IMHO. A bike kit includes a SAK cyber tool. It's left in a stuff sack in a pannier or other bag on my bike. Hard to see but justified by the pliers and potentially the need to cut things like cable ties. Whilst I won't have a direct need for it the fact my transport is a bike there's enough parts that might need a knife to repair enough to get home. Both situations have slightly questional reasons to justify carrying the knives involved. That is only a risk of I give someone a cause to discover the knife. Being someone who gives off the impression of law abidence apparently I just don't give the police a reason to stop me and search me. If they ever did I'd try the justification. That is only a back up to discretion. Isn't that approach appropriate?