Investigative journalism requires time and resources.

Mainstream media organisations sometimes collaborate with others, such as the likes of Bellingcat and Lighthouse Reports, to examine evidence in order to reveal the truth about a story.

Sky News did just this recently, as we carried out a joint investigation into the UK arms trade.

We revealed British-made riot shields are being used by some US police, including during Black Lives Matter protests.

But does our government know how many weapons the UK actually sells abroad?

On this edition of the Sky News Daily podcast, our defence correspondent Alistair Bunkall is joined by some of those involved in the investigation to share the findings, as well as discuss how this type of journalism works and the techniques used.

Sky's Victoria Elms is a digital news producer, Annique Mossou is a trainer and researcher for the online investigative journalism site Bellingcat, and Leone Hadavi is what is known as an 'Open Source Intelligence' investigator and analyst.

Daily podcast team:
Podcast producer - Annie Joyce
Podcast producer - Nicola Eyers
Podcast producer – Emma-Rae Woodhouse
Interviews producer - Oli Foster
Archive - Simon Windsor
Music - Steven Wheeler