http://www.usatoday.com/story/news/nation/2015/03/25/wisconsin-state-trooper-bank-robbery-suspect-shot-to-death/70415428/
"(The gunshots) were so fast it had to have been a semi-automatic weapon or something," Stevens said. "I'd say maybe 10 to 15 shots."Does "had to have been" mean "must have been"?