On our JMT-thur hike this year we were checked 3-4 times. But ironically, not in the Whitney Zone.
Yosemite is pretty aggressive in checking. There was a ranger patrolling Lylell canyon for the express purpose of checking permits. Chatting with him, he indicated that they have someone patrolling that area daily. We were also checked a couple times while in the Kings Canyon jurisdiction. I do recall a ranger at Tyndall asking for a permit. We were also asked about bear cans but not compelled to show them. And they always told us about where you can't have a fire.
The rangers were cool about it, just doing their job. In fact, we had planned to camp up Lylell Canyon just past the closed area, about 4 miles past the campground. The ranger in Lylell told us we were still a mile short, but was ok with it so long as the site was not visible from the trail and we did not plan a campfire.
If you can't get in exactly where you want, keep asking for options--different trail heads, different first nights, etc. They want to make it work for you.
--- In firstname.lastname@example.org, "mvkazit" <mvkazit@...> wrote:
> Small question about permits....... Does anybody from this group ever has been asked to show his/her permit on the trail ?