hiː wˈɪtnəst, ænd dᵻskɹˈaɪbd ɪn hɪz bˈʊks, ðɪ ˌɛvəlˈuːʃən ʌvðə nˈuː jˈɔːɹk sˈɪɾi pəlˈiːs dᵻpˈɑːɹtmənt fɹʌm ɐ kɚɹˈʌpʃənɹˈɪdən, ˈæntɪkwˌeɪɾᵻd ˌɪnstɪtˈuːʃən ˌɪntʊ ɐ kənsˈɪdɚɹəbli mˈoːɹ mˈɑːdɚn pəlˈiːs dᵻpˈɑːɹtmənt.
He witnessed, and described in his books, the evolution of the New York City Police Department from a corruption-ridden, antiquated institution into a considerably more modern police department.