I did a little looking online at the limits of our neighboring states along with ours.
Crappie (black and white combination)
TN 10" 15
AL 9" 30
AR 30
MS 30, I thought it was 10".
There is a state wide limit for us, where and what is it? I sent an email pointing it out.
A warden can say there's a size limit if fish the Tassahatchie river at New Albany, it is part of Sardis lake.
Fish below the dam at Pickwick, you are fishing in KY lake.

I got an email reply.
Good morning and thank you for contacting MDWFP. You are correct that there is no length limit for crappie on the waterbodies that you listed. Thanks for contacting MDWFP and let me know if you have any additional questions.
Josh Howell
Fisheries

My email to MDWFP
Looking at this link, Page 1.
https://www.mdwfp.com/media/304522/40-miss-admin-code-part-3-rule-14-statewide-creel-limits-rev-04-2023-final.pdf
Crappie (Black and white) 30 per day.
It doesn't show a length limit for areas that doesn't have restrictions. Like Tunica Cutoff, below I-55 at Enid, below Hwy 51 at Grenada.

I'll print it off to have with me.