ɪn tˈuː θˈaʊzənd nˈaɪntiːn, mˈɔːɹɪsən wʌz ɪnvˈɛstᵻɡˌeɪɾᵻd baɪ ðɪ ˌɪndᵻpˈɛndənt ˈɪŋkwɚɹi ˌɪntʊ tʃˈaɪld sˈɛkʃuːəl ɐbjˈuːs ˈɪɪksə, wɪð ˈɛvɪdəns fɹʌm ɪlˈaɪzə mˈænɪŋˌæmbˈʊlɚ ɐ fˈɔːɹmɚ dᵻɹˈɛktɚ dʒˈɛnɚɹəl ʌv ˌɛmˈaɪ fˈaɪv, hˌuː hɐdbɪn fɹˈɛndli wɪð mˈɔːɹɪsən fɚɹə tˈaɪm.
In 2019, Morrison was investigated by the Independent Inquiry into Child Sexual Abuse (IICSA), with evidence from Eliza Manningham-Buller (a former director general of MI5), who had been friendly with Morrison for a time.