▁In ▁several ▁fields , ▁such ▁as ▁hand writing ▁analysis , ▁where ▁the ▁expert ▁comp ares ▁sign atures ▁to ▁determine ▁the ▁lik elihood ▁of ▁a ▁forg ery , ▁and ▁medical ▁case ▁reviews ▁by ▁a ▁phys ician ▁or ▁nur se , ▁in ▁which ▁the ▁expert ▁goes ▁over ▁hospital ▁and ▁medical ▁records ▁to ▁assess ▁the ▁possibility ▁of ▁mal p ract ice , ▁exper ts ▁often ▁initially ▁charge ▁a ▁flat ▁fixed ▁fee ▁for ▁their ▁initial ▁report . ▁As ▁with ▁the ▁hour ly ▁fe es ▁discussed ▁previously , ▁the ▁amount ▁of ▁that ▁flat ▁fee ▁var ies ▁consider ably ▁based ▁on ▁the ▁review ing ▁expert ' s ▁field , ▁experience ▁and ▁reputation . ▁ ▁The ▁expert ' s ▁professional ▁fee , ▁plus ▁his ▁or ▁her ▁related ▁exp enses , ▁is ▁generally ▁paid ▁by ▁the ▁party ▁retain ing ▁the ▁expert . ▁In ▁some ▁circumst ance ▁the ▁party ▁who ▁prev ails ▁in ▁the ▁lit ig ation ▁may ▁be ▁entitled ▁to ▁recover ▁the ▁amounts ▁paid ▁to ▁its ▁expert ▁from ▁the ▁losing ▁party . ▁ ▁Scient ific ▁evidence ▁ ▁In ▁law , ▁scientific ▁evidence ▁is ▁evidence ▁derived ▁from ▁scientific ▁knowledge ▁or ▁techniques . ▁ ▁Most ▁for ens ic ▁evidence , ▁including ▁gen etic ▁evidence , ▁is ▁scientific ▁evidence . ▁ ▁F ry e ▁test ▁ ▁The ▁F ry e ▁test , ▁coming ▁from ▁the ▁case ▁F ry e ▁v . ▁United ▁States ▁( 1 9 2 3 ), ▁said ▁that ▁adm iss ible ▁scientific ▁evidence ▁must ▁be ▁a ▁result ▁of ▁a ▁theory ▁that ▁had ▁" general ▁accept ance " ▁in ▁the ▁scientific ▁community