It has been revealed that letters from former minister Denis MacShane admitting expenses abuses cannot be used to prosecute him because they are protected by Commons rules.
Officials said parliamentary privilege meant the key correspondence was withheld from police when they launched a probe into the MP two years ago.
And the documents are still not legally admissible - even though they were published in a Commons sleaze report today.
More top news
The NHS could save over £8 million a year on dental treatment if all 12-year-olds chewed sugar free gum after meals, a study claims.
Older people in England are living longer than ever before, a new report has revealed.
Firms that fail to address the pay gap between male and female employees with be listed in new league tables.