▁it ▁is ▁adm iss ible ▁in ▁a ▁court ▁of ▁law . ▁The ▁audio ▁expert ▁must ▁be ▁able ▁to ▁document ▁the ▁steps ▁they ▁took , ▁these ▁steps ▁must ▁be ▁rep lic able , ▁no ▁data ▁can ▁be ▁created , ▁and ▁no ▁judgment ▁based ▁ed its ▁or ▁delet ions ▁can ▁occur . ▁Ch anges ▁in ▁pitch ▁or ▁speed ▁can ▁also ▁render ▁a ▁recording ▁in ad miss ible . ▁ ▁The ▁courts ▁may ▁require ▁proper ▁chain ▁of ▁cust ody ▁documentation ▁with ▁this ▁evidence . ▁This ▁includes ▁appropriate ▁pre ca utions ▁to ▁ensure ▁that ▁the ▁evidence ▁is ▁properly ▁protected ▁and ▁stored . ▁ ▁If ▁the ▁enh ancement ▁is ▁performed ▁using ▁commer cially ▁available ▁software , ▁proof ▁of ▁vendor ▁specified ▁training ▁and ▁prof ic iency ▁may ▁be ▁required . ▁ ▁References ▁ ▁Audio ▁enh ancement <0x0A> </s> ▁F az ▁or ▁FA Z ▁may ▁refer ▁to : ▁ ▁People ▁▁ ▁Fahr ud in ▁K ud uz ović ▁( born ▁ 1 9 8 4 ), ▁Bos n ian ▁footballer ▁ ▁F az ▁Hus ain ▁( 1 9 5 2 – 2 0 0 6 ), ▁American ▁politician ▁ ▁O wen ▁Far rell ▁( born ▁ 1 9 9 1 ), ▁English ▁rugby ▁union ▁player ▁ ▁Fel iks ▁Z em de gs ▁( born ▁ 1 9 9 5 ), ▁Australian ▁speed c uber ▁ ▁Ir ving ▁F az ola ▁( 1 9 1 2 – 1 9 4 9 ), ▁American ▁jazz ▁clar inet ist ▁ ▁Roberto ▁F az ▁( 1 9 1 4 – 1 9 6 6