Does an ultrasound detect prostate cancer?

I was wondering if a normal pelvic ultrasound detects prostate cancer. My prostate was checked in an ultrasound about a month ago and it was normal. I'm wondering because I've had a lot of prostate problems and I'm only in my 20's. I knew a guy who was only 28 that had prostate cancer.

Does an ultrasound detect prostate cancer?
yes