Final answer:
The patient's refusal to sign the consent form means that the colonoscopy should be cancelled.
Step-by-step explanation:
According to medical ethics, it is important to obtain informed consent from patients before any medical procedure, including a colonoscopy. In this case, the patient, despite being an inmate in a correctional facility, has the right to refuse to sign the consent form. Therefore, the colonoscopy should be cancelled because the patient has not given consent.