The signs are there – within seconds of the presenter getting to their feet.  Presenter stares at the screen, while reciting the words on the Powerpoint.  Words you can see for yourself.  Don’t want to be that person?  Check out these handy hints: https://www.inc.com/jason-aten/please-stop-reading-off-your-powerpoint-slides-heres-what-to-do-instead.html