An article from Feb 2012:

Hjalmarsson played Thursday night against Dallas, his first appearance after missing seven games with a concussion. The 24-year-old Swede played just over 16 minutes against the Stars and his performance was described as “fine, steady” by head coach Joel Quenneville.

But Hjalmarsson leaving the team so quickly after coming back begs the question: Did he return from a concussion too soon?
…
Kruger first suffered his concussion when Penguins defenseman Deryk Engelland checked him in the head on Dec. 20. He missed one game, but returned against the Blue Jackets and endured some tough hits. His symptoms returned and he missed the last eight games.

Kruger eventually returned on Jan. 14
…
The Hjalmarsson and Kruger incidents rekindle memories of the hit Brent Seabrook absorbed from Raffi Torres in Game 3 of last year’s opening playoff round.

The hit appeared to knock Seabrook out, but he returned to the contest…only to be held out of Games 4 and 5 after concussion tests determined he shouldn’t play. Seabrook then returned for Games 6 and 7 of the series, at which point the Blackhawks’ concussion protocol was questioned. Former NHLer Keith Primeau took major issue with how the situation was treated.

“He should not have returned to play [in Game 3],” Primeau told CBC. “It’s extremely dangerous. He’s going to need time to recover.”

Also from Feb 2012:

After sitting out yesterday against Detroit, Blackhawks captain Jonathan Toews will also miss tomorrow’s home game versus Dallas.

The ‘Hawks are calling it an upper-body injury, which predictably has reporters asking if it’s a concussion.

“It’s upper body, we’ll leave it at that,” said coach Joel Quenneville, as reported by Adam Jahns of the Chicago Sun-Times.

However, a source tells ChicagoNow.com that Toews’ injury is indeed a concussion, and another source says it was suffered against the San Jose Sharks on Feb. 10.

If that’s the case, it raises the question, did Toews play five games with a concussion?

And from Nov 2012:

Blackhawks captain Jonathan Toews maintains he was symptom-free and “felt 100 percent” when he returned to Chicago’s line-up for the playoffs after sitting out two months with a concussion.

Except now he admits he wasn’t 100 percent.
…
In February, it was reported that Toews may have hidden his symptoms from the Blackhawks soon after he sustained the injury. And even in today’s concussion-sensitive era, players are going to do that.

But when Toews says, “My balance with my eyes closed and my head turned a certain way was terrible,” we can’t help but wonder if Chicago’s medical staff should have been able to identify that.

It always did seem a little curious that Toews was cleared to play just in time for the first game of the postseason.

He said himself he was shaky after the hit, he’s had a serious concussion in the past year, and they brought him right back to skating in a full practice without even following half of the normal concussion protocol.

Your just and idiot

the Sharks front office is garbage and the team on the ice is garbage.

garbage in, GARBAGE OUT!