The Ravens were penalized 115 times last season for an NFL-worst 1,094 yards.
Throughout training camp, the team is taking strides to ensure that those numbers drop this year.
There have been officials at every full-team practice so far this camp, including on Sunday, when veteran referee Ron Winter brought a crew to Westminster to watch practice as well as talk with the players about a few areas that the officials will closely monitor this season.
"I would say it's a big emphasis for us," Harbaugh said of the need to cut down on penalties. "It's always been a big emphasis, we think, but probably more so than it has been ever before. We try to have the best officials we can possibly find.
"Obviously, we had Ron Winter and his group out here early, and now we have some college guys out here that are candidates to become NFL officials, and we've told them to call it tight. And our coaches are instructed to coach the penalties - not argue about them - coach them. And we've always tried to do that, but I think more so this year than ever, probably."
Are the efforts paying off?
"Oh, we'll find out," Harbaugh said. "When the games start, we'll find out. I think guys have been very conscious about technique. There are very few holding calls out here and very few holds. There are very few [defensive pass interference penalties].
"I've seen improvement with regard to those things."