What is based on a strong presumption from an indication or experience, even if it comes from someone other than the patient in cases of identical illness, or based on the testimony of a skilled, trustworthy Muslim doctor: that is, someone whose condition is unknown and has not shown any corruption or justice. Refer to: Al-Badai 2: 97, Al-Fath Al-Qadeer 2: 253, and Radd Al-Muhtar 2: 421.