Originally Posted by MarinaVanessa:
I use a highlighter also. As soon as their pick-up time passes I highlight the space for the day's signature.
I use separate monthly sign-in sheets for each child so this works better for me.
Also I have a keyless entry system and each parent gets their own code that only works during their scheduled daycare hours so if they are 1 minute late they're locked out and have to knock, plus I have nest so they get video recorded walking up and their photo taken when they ring the doorbell. If I forget to highlight their line I'm reminded when they have to knock and I make sure to do that before I answer the door. Good luck trying to argue with me about whether they were late or not 
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I know... I love my ring doorbell because it sets off the motion sensor even if they don't ring the bell; I can watch them come to the door lol. Not easy to deny a video that can be saved for 30 days