▁in ad miss ible ▁by ▁courts ▁because ▁it ▁was ▁obtained ▁without ▁authorization . ▁In ▁most ▁juris dict ions ▁a ▁war rant ▁is ▁required ▁to ▁se ize ▁and ▁investigate ▁digital ▁devices . ▁In ▁a ▁digital ▁investigation ▁this ▁can ▁present ▁problems ▁where , ▁for ▁example , ▁evidence ▁of ▁other ▁cr imes ▁are ▁identified ▁while ▁investig ating ▁another . ▁During ▁a ▁ 1 9 9 9 ▁investigation ▁into ▁online ▁har ass ment ▁by ▁Keith ▁Sch ro eder ▁investig ators ▁found ▁por n ographic ▁images ▁of ▁children ▁on ▁his ▁computer . ▁A ▁second ▁war rant ▁had ▁to ▁be ▁obtained ▁before ▁the ▁evidence ▁could ▁be ▁used ▁to ▁charge ▁Sch ro eder . ▁ ▁Authentication ▁As ▁with ▁any ▁evidence , ▁the ▁pro ponent ▁of ▁digital ▁evidence ▁must ▁lay ▁the ▁proper ▁foundation . ▁ ▁Cour ts ▁largely ▁concerned ▁themselves ▁with ▁the ▁reli ability ▁of ▁such ▁digital ▁evidence . ▁ ▁As ▁such , ▁early ▁court ▁dec isions ▁required ▁that ▁authentication ▁called ▁" for ▁a ▁more ▁compreh ensive ▁foundation ." ▁US ▁v . ▁Sch ol le , ▁ 5 5 3 ▁F . 2 d ▁ 1 1 0 9 ▁( 8 th ▁Cir . ▁ 1 9 7 6 ). ▁As ▁courts ▁became ▁more ▁familiar ▁with ▁digital ▁documents , ▁they ▁back ed ▁away ▁from ▁the ▁higher ▁standard ▁and ▁have ▁since ▁held ▁that ▁" comput er ▁data ▁comp il ations … ▁should ▁be ▁treated ▁as ▁any ▁other ▁record ." ▁US ▁v . ▁V ela , ▁ 6 7 3 ▁F . 2 d ▁ 8 6 , ▁ 9 0 ▁( 5