1) What does 'carrying' something 'on your body' mean. Yes obvious cases where it would apply. Less so when it wouldn't. Say having a bag/jacket on/under your chair and fetching things from it at need?
As I noted earlier it probably needs saying at least that this means on your person outside the playing area or some such. It'd obviously greatly reduce storage problems if you just had to give things to arbiters when going to the toilet/outside for a walk etc.
2) Electronic devices gets very wide and can lead to some problems, some amusing pedantry, some real:
a) Anybody picking up, or arguably even grasping (touching?!), the electronic chess clock that they're using is definitely carrying and has it 'on their person' and as such should be instantly (their wording) defaulted
b) Wristwatches - these are tricky because smart watches are just starting to appear in the main stream and even dumb ones are an obvious sort of place to try and conceal a subtle transmission mechanism. Still even the purely anologue watch I'm wearing uses a battery and so qualifies as electronic.
I think they're probably worth cracking down on for serious events, for more normal ones you'll get a lot of slightly baffled people.
c) More seriously (perhaps), things like pace makers, hearing aids and the stuff that blind players need to play. I guess there are already blanket exemptions from the rules for things like this? There had better be of course, or you'd probably be plain illegal vs disabilty legislation etc.