-10 Concealability for Smuggling compartments and Fingertips. I don't recall the number for Cyberweapons but I presume it's similar. Basically, you're not going to find it. Maybe a full body strip search gets you an outside chance.
So either a MAD or a Cyberscanner. A monowhip should coast on past an MAD, as well as a few other specific weapons. Remember kids, insist on Titanium claws! : ) Even then a weapon implanted inside a cyberlimb should be nearly MAD proof as "Yes, officer, my arm is metal." Unless the MAD gets a pile of hits and is sensitive enough to detect specific metal outlines *inside* a metal container.
Cyberscanners are really the only thing that is likely to spot an implanted weapon, and they need enough hits to detect the Cyberware and in some cases more to I.D. the sub-systems. "Again, yes, my Arm is Cybernetic, thank you officer, is there anything else?"
Chemsniffers can spot the ammo, but if the ammo is sealed in, it's unlikely, but its about the best chance.
RAW a Deltaware Fingertip compartment is going to get you and your monowhip pretty much anywhere. Ditto a Deltaware limb and a Smuggling compartment/implanted weapon. Best scanner is rating 8 with 3 extra dice from modifiers so 11 dice. Any Delta ware needs 5 hits just to spot, and potentially a sixth to get info on the sub systems. Very unlikely. For around 50k you can have a Monowhip and SMG pretty much anywhere. Delta Fingertip Monowhip, Delta Lower Leg and Smuggling compartment, throw in a MAD proof H&K Combat SMG. 'gratz! You're about as lethal as the Adept or Mage that don't need silly guns or knives.