I get wanting to believe your kid, but I also know as a parent, that 99% of the time, you are NOT getting the full story.
I got an angry call from a mother of a first grader I saw yesterday, asking why I didn't call her yesterday to tell her that her snowflake had a fever. Apparently when she got picked up from her after school program at 6:00 pm (I saw her at 11:20 am) she had a fever of 103. I pull up my note from yesterday and say "because she did not have a fever yesterday. If she had a fever I would have sent her home". So mom says "She told me she came to see you yesterday and you told her she had a fever and sent her back to class". So I read her the end of my note out loud "Allowed student to sleep for 30 minutes and re-checked temp- 99.2. Student stated she feels better so sent her back to class". Mom was silent after that
Edited to add that I also made sure mom understands that a fever is anything over 100.4 at our school, in case she mistakenly thought the 99.2 was a fever.