Used coronavirus swab tests were accidentally given out to households in Birmingham, council officials said.
Birmingham City Council said about 25 kits were given out by mistake in the student area of Selly Oak as part of its “drop-and-collect” service.
It said the error was quickly realised, the kits remained intact and there was no evidence of cross-contamination.
However, student Sophie Dunne, who was given a used kit, said some people had opened and used the testing kits.
Ms Dunne said she was approached by council workers at her home in Tiverton Road who she said wanted to give her a free kit because the area was “high risk”.
There are 237 Covid-19 cases currently in Selly Oak and neighbouring Edgbaston South and University wards, making them two of the worst hotspots in the city.