After we have made sure he has done no further mischief.

And Clinton laid the groundwork for further mischief from his party colleagues.

A little bit of paranoia could go far toward keeping him out of any further mischief.

They would anyway, and hopefully that would keep them out of further mischief.

He yanked her hand away to keep her from further mischief.

Wait here, until I have you bound and gagged, safe against further mischief!

"You have the look of further mischief about you," Finesse said.

"We'll try to keep her out of further mischief."

It seems he had investigated my statements, found them to be correct, and stepped in to prevent any further mischief being done.

Maybe it would keep them out of further mischief.