How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Jo C. Your Own Question

Jo C.
Jo C., Barrister
Category: Law
Satisfied Customers: 69367
Experience:  Over 5 years in practice
Type Your Law Question Here...
Jo C. is online now

My son has just failed drink driving blood test, 90mg in 100

Customer Question

My son has just failed drink driving blood test, 90mg in 100 blood. He had an accident, no one else involved no damage to any other property. his car written off as he hit a tree.
He failed a breth test taken in hospital, then had a blood test. The police doctor attended the hospital, the blood was taken from a hospital drip line inserted into a vein, not directly from a vein, does this has any impact on the legal procedure. Also we have a second sample of blood is it worth getting this tested and how do we go about this? My son is 19 years old first offence.
Submitted: 3 years ago.
Category: Law
Expert:  Jo C. replied 3 years ago.

Thank you for your question. My name is XXXXX XXXXX I will try to help with this.

Did he provide a breath test at scene and what was the reading please?
Customer: replied 3 years ago.

He was injured and taken to hospital, breath test was taken in hospital, they did not give reading the police officer just said it was a fail.


Expert:  Jo C. replied 3 years ago.

If this is 90 on blood then thats a fairly low reading. It might be worth a second. Analysis to see if it falls under. The limit is 81 ml but that only equates to 35 mg in breath and they would not normally charge unless a person blew over 40 mg in breath. Blood tests are thought to be more accurate though so its a risk but a second analysis wouldn't be a bad idea.

The fact of the drip wouldn't make any difference unless there is any suggestion of tampering which is obviously unlikely.

The aggravating feature is the accident.

However, if this is 90 ml then he is only facing a fine and a ban of between 12-16 months. If he does the drink driving course that he will probably be offered then that will shave off one quarter but there is a cost.

Also if he pleads there will be costs of £85. If he contests the matter and is convicted then the costs will be about £350.

There will be a victim surcharge that reflects his means.

He should not drive to court. He will be banned and unable to drive home and you will not believe the problems he will save himself but getting on a bus instead

Can I clarify anything for you?

Customer: replied 3 years ago.

Thank you for your answer, can you clarify

1. if i get the second sample analyised and it falls below the 80 will the police use the failed breath test to charge him, this was taken some time earlier?

2. Do the police have to disclose now what the failed breath test reading was?

3. I have a second blood sample given to us at the time the blood was taken in a sealed bag, how do I get this tested so that it is permissable evidence if it falls below the 80 ml?

4. What happen if this second test is a higher reading.



Expert:  Jo C. replied 3 years ago.
1 The sample you have should have been taken at the same time that they took a specimen? Thats what normally happens.

2 No because it was failed so there won't be a reading.

3 Try here

4 There's no way it could if it was taken from the same specimen but you are not under an obligation to disclose that if it were to happen.
Customer: replied 3 years ago.

Thanks, XXXXX XXXXX clarify

If we got the blood sample tested and it was below 80 (yes it was taken at the same time) we could use this even though the police gave him as breath test as well earlier which he failed?

can they just use the breath test to charge him?

Expert:  Jo C. replied 3 years ago.
Yes, that would be a challenge.

They can't rely on a failed breath test as, by definition, it failed.
Customer: replied 3 years ago.

one further point, when i talk about a failed breath test I mean he was over the limit on the breath test and they then asked him to provide a blood sample.


Is that your understanding of what I was asking?

Expert:  Jo C. replied 3 years ago.
No, I thought you meant the machine failed.

I think he probably blew between 40-50. Thats why they sent him for a blood test which is unfortunately slightly over.

Normally they will not charge a person unless they are over 40 even though the limit is 35 unless a blood test is over 81ml.
Customer: replied 3 years ago.

So do they have to disclose now the breath test reading?

If it was over 40 they could charge him based on breath test alone, even if the second blood sample was below 80?

Expert:  Jo C. replied 3 years ago.
Not if they are not relying on it but if they are asked then they will disclose it.

If it was over 40 they could rely on the breath specimen but usually they will only do that if the blood reading it over 81ml.
Jo C., Barrister
Category: Law
Satisfied Customers: 69367
Experience: Over 5 years in practice
Jo C. and 2 other Law Specialists are ready to help you
Expert:  Jo C. replied 3 years ago.
Thank you for the positive rating and remember that I am always available to help with your questions. For future information, please start your question with ‘FOR JO C’

What Customers are Saying:

  • Thank you so much for your help. Your answers were really useful and came back so quickly. Great! Maggie
< Previous | Next >
  • Thank you so much for your help. Your answers were really useful and came back so quickly. Great! Maggie
  • A quick response, a succinct and helpful answer in simple English. I believe I can now confront the counter party with confidence -- worth the 30 bucks! Rick
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C.
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther

Meet The Experts:

  • Jo C.

    Jo C.


    Satisfied Customers:

    Over 5 years in practice
< Last | Next >
  • Jo C.'s Avatar

    Jo C.


    Satisfied Customers:

    Over 5 years in practice
  • Ben Jones's Avatar

    Ben Jones

    UK Lawyer

    Satisfied Customers:

    Qualified Solicitor - Please start your question with 'For Ben Jones'
  • Buachaill's Avatar



    Satisfied Customers:

    Barrister 17 years experience
  • Max Lowry's Avatar

    Max Lowry


    Satisfied Customers:

    LLB, 10 years post qualification experience
  • UK_Lawyer's Avatar



    Satisfied Customers:

    I am a qualified solicitor and an expert in UK law.
  • Kasare's Avatar



    Satisfied Customers:

    Solicitor, 10 yrs plus experience in civil litigation, employment and family law
  • Joshua's Avatar



    Satisfied Customers:

    LL.B (Hons), Higher Prof. Dip. Law & Practice