Final answer:
The Shroud of Turin was tested using carbon-14 dating by three independent laboratories in 1988, which found that it contained 92% of the carbon-14 found in living tissues, dating it to the Middle Ages.
Step-by-step explanation:
The Shroud of Turin has been tested using the technique of carbon-14 dating. This method was applied to the shroud in 1988 and was executed by three independent laboratories. Each of these laboratories was provided with four pieces of cloth, including one unidentified piece from the shroud, to prevent bias in the testing process. The results indicated that the samples from the Shroud of Turin contained 92% of the carbon-14 found in living tissues. This level of carbon-14 allowed scientists to date the shroud, concluding that it originated in the Middle Ages, specifically around 600-700 years ago. This testing suggests that the shroud is much younger than the time of Jesus, casting doubt on its authenticity as Jesus' burial cloth.