Government inspectors have carried out a surprise inspection at the hospital at the centre of a police probe into insulin poisoning.
Experts from health watchdog the Care Quality Commission (CQC) said on Sunday it carried out the inspection at Stepping Hill Hospital in Stockport last month.
Detectives believe somebody at the hospital injected saline with insulin, poisoning 22 patients. The contamination was discovered in July last year.
A CQC spokesman said it had carried out the unannounced inspection to monitor patient care and welfare.
Hospital bosses said safety procedures have been reviewed since the contamination was discovered.
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