That's true, but are those colleagues allowed to talk about the work that the person did? At a lot of places, the only thing the manager can confirm is that th

That's true, but are those colleagues allowed to talk about the work that the person did? At a lot of places, the only thing the manager can confirm is that the person worked there during the dates given on the resumé. Further questions are to be directed to HR, which will filter any genuine feedback the manager can give.