▁Because ▁they ▁were ▁hom eless , ▁the ▁volunte ers ▁saw ▁these ▁re wards ▁as ▁very ▁attract ive . ▁Additionally , ▁their ▁lack ▁of ▁education ▁made ▁it ▁more ▁likely ▁for ▁the ▁Bow ery ▁men ▁to ▁volunte er ▁for ▁Hudson ' s ▁experiments , ▁as ▁they ▁could ▁not ▁fully ▁understand ▁what ▁they ▁were ▁signing ▁up ▁for . ▁In ▁particular , ▁at ▁the ▁time ▁of ▁the ▁experiment , ▁the ▁method ▁of ▁open ▁per ine al ▁bi ops y ▁was ▁new ▁and ▁largely ▁un test ed , ▁and ▁it ▁would ▁have ▁been ▁unlikely ▁for ▁someone ▁to ▁volunt arily ▁under go ▁the ▁procedure . ▁ ▁Moreover , ▁the ▁volunte ers ▁were ▁very ▁ill - in formed . ▁They ▁were ▁not ▁provided ▁with ▁clearly ▁written ▁papers ▁about ▁the ▁d angers ▁of ▁the ▁bi ops ies , ▁such ▁as ▁rect al ▁te aring . ▁Even ▁though ▁the ▁per ine al ▁bi ops y ▁approach ▁seemed ▁to ▁have ▁its ▁benefits , ▁its ▁potential ▁risk ▁for ▁rect al ▁per for ation ▁was ▁quite ▁high . ▁ ▁In ▁an ▁interview , ▁Hudson ▁def ended ▁his ▁experiment ' s ▁eth ics . ▁He ▁said ▁he ▁felt ▁no ▁regret , ▁saying ▁the ▁volunte ers ▁seemed ▁to ▁him ▁to ▁be ▁fully ▁aware ▁of ▁the ▁aspects ▁involved ▁in ▁the ▁study . ▁Also , ▁they ▁did ▁not ▁receive ▁any ▁mon et ary ▁in cent ives ▁from ▁him ▁to ▁particip ate , ▁which , ▁otherwise , ▁he ▁thought , ▁would ▁" const itute ▁co erc ion ". ▁Once ▁becoming ▁aware ▁of ▁Hudson ' s ▁practices , ▁an ▁editor ▁of