Is the physician's review of the fatwa, or making it a clause in the contract between the physician and the laboratory, sufficient to avoid falling into the unlawful, if the laboratory is equipped to the highest standard, and the physician appears to be proficient and trustworthy, but the laboratory owner fears that he may not be so inwardly?

If the doctor falls short in his professional duties and deceives the patient, the sin is his alone, especially if the laboratory owner is unaware of the doctor's betrayal. This is because one who is ignorant of his partner's intention does not have a corrupt contract. The doctor must not refer the patient to a laboratory unless there is a genuine need for the tests, and he must choose the most beneficial and accurate laboratory for the patient. He is accountable before Allah and the patient. If the laboratory owner knows or strongly suspects the doctor's betrayal, then it is not permissible for him to cooperate with the doctor, in accordance with the Almighty's saying: "And do not cooperate in sin and aggression." It is more appropriate to avoid dealing with doctors who use this matter as a means of illicit gain at the expense of patients.