abu mikhnaf

Q: I have heard that in your kitaab on the topic of Karbala and Yazeed, the respected author quotes from the book al-Bidaayah wan-Nihaayah. Such narrations are quoted which ibn-Katheer Rahmatullahi alaihi at the end of the discussion himself says that these narrations are fabricated. Is this true? I sincerely hope that Mufti Saheb will clarify this matter for me and many others who have heard this.

Q: Could you explain to me the correct opinion regarding Yazeed bin Mu'aawiyah? I read the book "Revealing the True Facts of Yazeed ~ The Incident of KARBALA and the Events that Followed". I found it to be very beneficial, however I have heard that there is a weak narrator by the name of Abu Mikhnaf, who appears in some of the reports quoted in the book. Is this correct? 

Q: Mufti Saheb, I have heard that some of the narrations in the book "Revealing the True Facts of Yazeed ~ The Incident of KARBALA and the Events that Followed" are quoted through a weak, shia narrator, by the name of Abu Mikhnaf. Is this correct? If it is, then can we quote from such narrators?