Leaving behind or turning off yourtrackersmartphone has already been treated as evidence of guilt. It's not yet considered proof of guilt by itself, but it is considered evidence of guilt.
All he had to do was leave his phone by the bed he was claiming to be tied to while running around the house, it's not rocket science.
It's more the guys ignorance/stupidity in not not understanding the extent to which smart watches and smart phones (and pretty much every 'smart' device) monitor people that he has been caught, rather than clever policing.