▁the ▁remaining ▁Just ices ▁did ▁not ▁reach ▁the ▁issue . ▁ ▁Cass ell ▁has ▁recently ▁def ended ▁pro - active ▁law ▁enfor cement ▁investigation ▁techniques , ▁arg uing ▁that ▁the ▁ 2 0 1 6 ▁Chicago ▁hom ic ide ▁sp ike ▁har med ▁many ▁vict ims ▁and ▁was ▁att rib utable ▁to ▁an ▁“ AC L U ▁effect ” ▁restrict ing ▁stop - and - fr isk ▁by ▁Chicago ▁police ▁officers . ▁While ▁the ▁argument ▁has ▁been ▁disput ed , ▁Att orney ▁General ▁Jeff ▁S essions ▁has ▁c ited ▁it ▁as ▁a ▁well - f ounded ▁analysis . ▁ ▁Cass ell ▁has ▁also ▁question ed ▁the ▁frequency ▁with ▁which ▁innoc ent ▁persons ▁have ▁been ▁wrong fully ▁conv icted ▁for ▁cr imes ▁they ▁did ▁not ▁commit , ▁calling ▁for ▁close ▁scr ut iny ▁of ▁cases ▁involving ▁especially ▁vulner able ▁defend ants ▁rather ▁than ▁a ▁general ▁approach ▁to ▁the ▁issue . ▁ ▁Cass ell ▁has ▁also ▁successfully ▁served ▁as ▁a ▁defense ▁att orney ▁in ▁several ▁cases ▁where ▁police ▁officers ▁were ▁charged ▁with ▁cr imes ▁ ▁Ch alleng es ▁to ▁the ▁Mir anda ▁Dec ision ▁ ▁Cass ell ▁has ▁been ▁a ▁leading ▁critic ▁of ▁the ▁U . S . ▁Supreme ▁Court ' s ▁decision ▁in ▁Mir anda ▁v . ▁Arizona . ▁In ▁ 2 0 0 2 , ▁the ▁Supreme ▁Court ▁invited ▁Cass ell ▁to ▁argue ▁in ▁defense ▁of ▁a ▁decision ▁by ▁the ▁U . S . ▁Court ▁of ▁App e als ▁for ▁the ▁Four th ▁Circ uit , ▁which ▁had ▁held ▁that ▁a ▁federal ▁stat