TurretinFan recently wrote a post about the Shroud of Turin. In that post, he cites a comment I made about an interview with Gary Habermas on the subject. I had said that Habermas addresses whether the Shroud is consistent with John 20:7. However, TurretinFan notes that Habermas doesn't discuss John 20:7 during that interview.
It looks to me like I was confusing Habermas' interview with Greg Koukl and an interview Habermas did with somebody else. I don't remember where the other interview occurred, but I have a strong memory of hearing an interview in which Habermas commented on John 20:7 and the Shroud. It appears that I wrongly attributed his comments to the Koukl interview, even though it was actually a different one. I apologize for the mistake, and I'm going to go back to my original post, which TurretinFan linked, and make note of his correction.
Habermas has addressed John 20 in writing as well. For example:
"But careful investigation into the NT and other early Jewish literature clearly reveals that this napkin was folded up and tied around the head in order to keep the jaw closed during the onslaught of rigor mortis. This practice is reported in both the Mishna (b. Sabb. 23.5) and the Code of Jewish Law in a section entitled 'Laws of Mourning,' which is a record of early Jewish burial practices. More important for the evangelical is that the gospels affirm the same. In John 11:44 the napkin is said to have been placed 'around' the head (perideo)....This is a good example of a rejection made apart from the facts, for scientific testing indicates that the man buried in the shroud was, in fact, buried in at least four strips of linen. In addition to the major cloth known as the shroud, he was also wrapped around the head with a napkin as well as having his wrists and ankles tied together. Lazarus was also bound around his head, wrists and ankles (John 11:44)." (source)
"But you're right that it does nothing to disprove the shroud of Turin, since the man in the shroud also appears to have a face cloth wrapped around his head....In my opinion, I don't think John 20:7 disproves the shroud of Turin at all. In our books on the shroud, Ken Stevenson and I argued that there was indeed a face cloth around the head of the man buried in the shroud. There appears to be a gap caused by something between the man's face and hair, keeping the hair from resting on the face. If this is the face cloth, it appears to be what is what is described in John. John 11:43-44 (Lazarus) and 20:7 (Jesus) are the only places in the New Testament where a face cloth is mentioned and in both places, it is described as being placed around the head or face. Further, as we describe in our book, the Jewish Mishnah commands that the jaw be bound up after death. On the shroud, it appears that this is exactly what happened. For example, the beard under the chin is also pulled back against the throat by the same invisible object that appears to be wrapped around the face of the man." (source)
We know that multiple cloths were used in Jesus' burial, but we don't know the total number of cloths or many other details. What we're doing is making a probability judgment based on the totality of the evidence.
I think the Shroud is likely to be one of the burial cloths of Jesus and, therefore, evidence for Jesus' resurrection and some of the other details about the events surrounding Jesus' death recorded in the gospels and other ancient sources. TurretinFan's objections are outweighed by the contrary evidence, like what Habermas discusses in the Koukl interview. I would point people to that interview as a good overview of the topic, but I shouldn't have cited it regarding John 20:7 in particular. I don't see how TurretinFan concludes that the Shroud "cannot possibly be real", that "we can be sure that the shroud is a hoax", and that "The jury's not out" based on the considerations he mentions.