Drink drive question

[v8sag]

Doe's anyone know how long it takes to get back results from a police blood test and if you get any correspondence back if it comes out negative?
A friend of mine got nabbed three weeks ago after only a small session but wanted to play it safe with a blood test,she's hesitent to call the police to see whats happening in case they've made a botch up.

[Kiwi XTR2]

Not sure.

You could try an anonymous enquiry to the Police regarding the process or possibly the Citizens Advice Bureau.