Did Thomas actually touch Jesus's side? John 20:24-29
  24Now Thomas (also known as Didymus[a]), one of the Twelve, was not with the disciples when Jesus came. 25So the other disciples told him, “We have seen the Lord!” But he said to them, “Unless I see the nail marks in his hands and put my finger where the nails were, and put my hand into his side, I will not believe.”
  26A week later his disciples were in the house again, and Thomas was with them. Though the doors were locked, Jesus came and stood among them and said, “Peace be with you!” 27Then he said to Thomas, “Put your finger here; see my hands. Reach out your hand and put it into my side. Stop doubting and believe.”
  28Thomas said to him, “My Lord and my God!”
  29Then Jesus told him, “Because you have seen me, you have believed; blessed are those who have not seen and yet have believed.”


I either always lazily read or remember being taught that Thomas actually touched Jesus's side (or maybe The Incredulity of Saint Thomas by Caravaggio influenced me). But under close reading it appears that Thomas didn't touch Jesus, he merely saw Jesus because the scripture doesn't explicitly say he touched Jesus and Jesus said "Because you have seen me, you have believed; blessed are those who have not seen and yet have believed.” (emphasis added mine).

Is this a good interpretation and/or is there any other scripture that would support or not support this?
Safe answer: John 20 is the only passage of scripture that discusses this event, so the short answer is - we can't say for sure.  In general, we need to be cautious about "reasoning from an absence of scripture."

My guess: Thomas made a statement to the effect of "I refuse to believe that Jesus rose from the dead, and the only thing that could change my mind would be if He Himself appeared and proved it to me".  He is pretty "over the top" with his demand, because not only did he say Jesus had to appear, but that Thomas would have to actually stick his fingers in each of Jesus' wounds!  I think he was trying to make it very clear where he stood on the matter!

Jesus responded by appearing to him and offering to grant his request.  Thomas appears to have been shocked and humbled by this, and seems very repentant, judging by his statement, "My Lord and my God!"  I have a very hard time believing that Thomas proceeded to probe each of His wounds with his fingers, but that's just a guess.