Can you give any sources for plea bargains not being used outside of the US? I'm mostly familiar with US law but my understanding is that plea deals are used in most commonwealth/adversarial system countries such as the UK, Canada, and Australia.

For example I can find a lot of Australian lawyers discussing plea deals.

> There are three main types of plea deals in Australia:

> Charge Bargaining – The defendant pleads guilty to a lesser charge than initially filed. For example, a charge of aggravated assault may be reduced to common assault.

> Sentence Bargaining – The defendant pleads guilty in exchange for a lighter sentence recommendation from the prosecution.

> Fact Bargaining – The prosecution and defence agree on which facts will be presented to the court, potentially influencing sentencing outcomes.

https://newsouthlawyers.com.au/plea-deals-in-australia-what-...

If you just mean that plea deals are not used by inquisitorial systems then obviously that makes sense.

Please bargains are allowed and used in the UK but their existence is not as explicit as in the US, hence most (English or perhaps British) people thinking they may not exist in English or Scottish common law. There’s certainly less statistical data on their use collected.