Is it possible to Vanish humans?

Question

We see in Harry Potter and the Order of the Phoenix that McGonagall has her Transfiguration students practice the Vanishing Charm (Evanesco) on mice (and has previously had them do snails):

“As I was saying, the Vanishing Spell becomes more difficult with the complexity of the animal to be vanished. The snail, as an invertebrate, does not present much of a challenge; the mouse, as a mammal, offers a much greater one. This is not, therefore, magic you can accomplish with your mind on your dinner. So — you know the incantation, let me see what you can do. . . .”

^{Harry Potter and the Order of the Phoenix}

...and Ron manages to vanish most of his mouse:

“Well, it’s a start,” said Ron, holding up a long, wriggling mouse tail and dropping it back into the box Lavender was passing around.

^{Harry Potter and the Order of the Phoenix}

This raises the question of is it possible to Vanish humans? We've seen that mammals (such as our friendly, little mouse) are not exempt from being Vanished. Does this hold true for humans?

^{(Related Question)}

Answer 1

In Chapter Eleven of Philosopher's Stone we are told about referees vanishing:

that although people rarely died playing Quidditch, referees had been known to vanish and turn up months later in the Sahara Desert.

It is not entirely clear how they were vanished, or where they were for the interim period, but this does at least show that some form of vanishing humans is possible.

In Chapter Six of Chamber of Secrets Harry wants to use a Vanishing Spell on himself, which might imply that it is possible to vanish humans:

"Off you go, move along there," Lockhart called to the crowd, and he set off back to the castle with Harry, who was wishing he knew a good Vanishing Spell, still clasped to his side.

However, it is also possible that Harry incorrectly thinks that you can vanish people, or that he knows that it's not possible but wishes it was possible.

Answer 2

Probably not

When Barty Crouch, Jr, needed to secretly dispose of his father's remains, he chose transfiguration and burial:

'When everyone was gone, I Transfigured my father’s body. He became a bone … I buried it, while wearing the Invisibility Cloak, in the freshly dug earth in front of Hagrid’s cabin.'

— Barty Crouch, Jr; Goblet of Fire, Chapter 35: Veritaserum

Vanishing, if it had been an option, would have been faster and less likely to result in discovery.