body. you see something appear here, above his kneecap. it gets released. reporter: as it releases as it rereleases, his hand gs up higher. there it is. what is that? you know, that s the question, of course. reporter: let s see it again. here it is released. reporter: that s it right this. i cannot be precise identifying it. reporter: seconds later, we zoom in to see the officer pick something up in the grass. perhaps the very same object he dropped. first let s see if we can see it in the grass. reporter: there he goes, picking it up. let s start with that image first. okay, now there s clearly something reflecting. reporter: if that something is a taser, investigators will certainly want to know how it got there. randi kaye, cnn, new york. to some other big stories we re following for you. it took less than 12 hours for a jury in massachusetts to find dzhokhar tsarnaev guilty on all 30 count in the boston marathon