The German professional body for translators and interpreters, the BDÜ (Bundesverband der Dolmetscher und Übersetzer) makes available a video of a simulated trial involving German/Italian interpreting.
The video was recorded in 2010, and includes a number of difficulties that might arise in practice.
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To find more about the BDÜ, see here.
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From Words to Deeds: translation & the law 