This seems to be borne out by the events of Chapter 79:
Albus said heavily, “A person who looked like Madam McJorgenson told us that a single Legilimens had lightly touched Miss Granger’s mind some months ago. That is from January, Harry, when I communicated with Miss Granger about the matter of a certain Dementor.”
Even if Hat and Cloak is Quirrell, the job had to be done the hard way, without Legilimency.
This seems to be borne out by the events of Chapter 79:
Even if Hat and Cloak is Quirrell, the job had to be done the hard way, without Legilimency.