The ItemToss Event is fired whenever an Item is being tossed from a player's inventory.
Canceling this event will prevent the item from entering the world, thus causing the item to be deleted.

You will need to cast the event in the function header as this class:
crafttweaker.event.ItemTossEvent
You can, of course, also import the class before and use that name then.

PlayerDeathDrops Events implement the following interfaces and are able to call all of their methods/getters/setters as well:

• IEntityEvent
• IEventCancelable

ZenGetter	Type
ZenGetter item	Type IEntityItem
ZenGetter player	Type IPlayer