Singapore accidentally disposed of some COVID-19 swab samples before being tested following lapses in the protocol, prompting authorities to investigate the matter.The sample, collected from clinics under the Swab-and-Send-Home (Sash) programme, were inadvertently discarded before testing at the lab.About 233 COVID-19 swab samples were disposed of, leading to retesting of patients, The Straits Times reported on Monday.The incident at Quest Laboratories happened last Wednesday and was discovered two days later when clinics began contacting the lab to ask about the test results for these patients.Under the Sash programme, patients who meet certain criteria are swabbed and then sent home to wait for their test results.