When will we ever give up promoting jails as a possibility. It just won't work at least in the USA. Drugs are as big or bigger a problem than weapons and shoes must be taken off to check the tongues and insoles for storage. As for court houses, what good is a metal detector for the feet if I could have a holstered Glock .45 under my coat? Maybe that is why the courtroom has an armed marshall.
Get real. If the mag-shoe would fill a need in these situations, they would have been operational for the past several years. It isn't like it is a new idea every time someone brings it back up to try to promote a possible future for this dog. IDOI would have a tough time "placing" units in these situations as they would only get in the way of the job needing to get done.