About: http://webisa.webdatacommons.org/407140650

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	They do so already, of course, although cellphones in particular are often required to be turned off or stowed in backpacks or lockers.
http://www.w3.org/ns/prov#wasQuotedFrom	kqed.org