I've heard in video games and TV shows some male speakers using す or っす in place of です. For example, instead of "本はどこですか" they say "本はどこすか". Does dropping the で make the sentence any less polite? Are there situations where it would be appropriate to use です but not (っ)す?

  • 逆転裁判's 糸鋸刑事 comes to mind
    – waldrumpus
    Jun 7 '16 at 14:24