Ok: I'll bite.Who said anything about being held? Police do have the right to investigate everything on the person that has to do with the crime at hand. Not to so would be like disregarding computers of suspects in child porn cases.
What does someone's mobile phone have to do with possession of illicit substances?
If I saw a random person staggering down the street with a bong or cooking something in a rusty teaspoon; I would not be able to tell if they have a dealer saved to their contacts as opposed to having obtained it from a "friend"/rave/street-corner etc.
Besides which; the specific crime was possession. If not dealing, then surely that's as far as it goes? Actually supply of the substance(s) is a different person and a different offence.
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