What is Harper's Law?published at 09:16 BST
After PC Andrew Harper's death, his widow Lissie led the campaign to introduce "Harper's Law".
Passed by Parliament, the law gives mandatory life sentences to the killers of emergency services workers. It also doubles the maximum penalty from 12 months to two years for those who assault police or other emergency workers.
Although PC Harper was killed in 2019, the new rules were introduced in 2022 and did not apply retrospectively to the sentencing of his killers.
That's one of the concerns raised by those campaigning against their early release.




