To find out how much time phones spend keeping one ear open, Shin and Zhang conducted an extensive trace-based analysis of real WiFi networks.

ENGADGET: New 'subconscious mode' could improve smartphone battery life, supress your WiFi id

Toxicology tests carried out as part of the autopsy were handed to an expert in Geneva for analysis before a definitive conclusion was reached, but the tests found that there was no trace of stimulants.

BBC: Marc-Vivien Foe