I'm a grudging holder of a view I deem the "rag doll" theory of identity & evidence gathering: if they can get it from your limp body without coercion or harm (

I'm a grudging holder of a view I deem the "rag doll" theory of identity & evidence gathering: if they can get it from your limp body without coercion or harm (needles & "intimate" contact included), they can have it. Facial photos, fingerprints, DNA ... things which can on the whole be obtained by just following you around (touched surfaces, fallen detritus), and which circumstances may dictate a more manipulated form of acquisition (hold face up for frontal photo, manipulate fingers for prints, mouth swab for DNA). Anything involving jabbing, yanking, or threats - no. This view does presume the existence of enough evidence for warrantable arrest in the first place, which should entail a high legal barrier: a judicially signed warrant should be required prior to arrest if possible, and acquired promptly thereafter if impractical; failure to obtain one (before or after, independent of information acquired during holding) should require immediate disposal of anything gathered including arrest record.