There might be a letter on its way with a perfectly innocent explanation.

I don't see any innocent explanation for that kind of stuff.

But he told the judge that there was an innocent explanation.

"There could be some innocent explanation for it," he said.

What if there were an innocent explanation for your survival?

And for that kind of action there was never an innocent explanation.

All I can say is that there was an innocent explanation for what you saw.

Let them wonder: he had an explanation both interesting and innocent.

Of course, there could still be an innocent if bizarre explanation.

There may be a perfectly innocent explanation for the trip to Texas.