What type of device is used for collecting DNA samples from inmates?

The correct answer is a swab or buccal collector, which is specifically designed for collecting DNA samples. This method involves using a sterile swab to gather cells from the inner cheek of the mouth, which provides a reliable and non-invasive way to obtain genetic material. The collection process is quick and easy, reducing discomfort for the inmate and allowing for a standardized method for DNA extraction.

Other options do not capture DNA as effectively or appropriately for this purpose. A syringe is used primarily for drawing blood and would not be suitable for collecting DNA directly from non-blood sources. A blood collection kit, while capable of obtaining DNA, is more invasive and requires clinical expertise to perform properly, making it less practical for routine inmate sampling. Likewise, a fingerprinting device is unrelated to DNA collection as it captures unique patterns on the skin but does not provide any genetic information.