Remove upper case in tag words


About 2 years ago code was added to remove any capital letters in the tag words when they were uploaded. My site uses the capital letters because of names of people.

I think I had found the location once but now with an upgrade it is back to lowercase letters.
Where is the code to change the upper case letters?


-thought maybe upload.class.php or video.class.php- Nope
-tried searching for all instances of strtolower in all files and then looking for the code. - Still could not find it.
-tried searching for all instances of genTags - Nope
-thought maybe it was something to do with a structure setting on the database field- Nope
I’ve got at least 6 hours into this. Why can’t I find where it changes new tags into lower case letters?