Graduation card etiquette question

[Trub Lou]

We're finally getting to an age where our peers have their own kids graduating from high school.  I assume cold hard cash is still the preferred gift in most circumstances, but do people still write checks?  I'm not sure how I feel about leaving actual cash in a card out on a gift table that's likely to be unattended, and it's nice to know with a check that a gift was actually received rather than "lost"? 

What say you?  Cash or check for a graduation card?  Or do you just Venmo it right to the graduate's account nowadays?