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OP's case is different from Viking's. I think we are cleared up on the OP needing to answer yes to having been detained and just include dismissal paperwork. That's what I did and it all went smoothly.

As for Viking, I can't quite tell what's going on but I would say the answer should be the same. It doesn't matter how long ago it was, just say yes to having previously been detained and then get to work on finding that dismissal paperwork. Best case scenario your records are clean, you were upfront and they don't ask you about it. But if it shows up on any records they find for you and you didn't mention it, that would look bad.
 
thanks Ponga
we are putting it in the application we just wanted to make sure ahead of time.
 
Have something very similar going on. Can I get help?

Heres a post from a thread:

Hey Everyone,

I am about to start the sponsorship for my American husband. His FBI Record/PCC was received in September (we applied for it early). It came back as no record found and we were happy.
Some of the things I am posting here are personal but I need advice on what to do.

To start off he has been arrest 2 times.

1st: He was 17 and arrested for underage drinking.
- He got SIS probation (not 100% sure what that mean but I did a bit of research: https://definitions.uslegal.com/s/suspended-imposition-of-sentence-sis/) for 6 months and it ended early (he only saw the probation officer 4 times rather than 6). But he was technically still a minor.

2nd: He was 18-19 and arrested for a fight with his dad. His dad is the one who started it (he grew up very roughly and has dealt with a lot with his family). His dad wife at the time didn't see what happened but made it seem like he started it and she wanted to press charges. It went to court and his dad dropped the charges, but the state of Missouri picked them up.
- He got SIS probation again for 6 months and it ended early (he only saw the probation officer 2 times rather than 6) and was granted permission to visit Canada with me. He proved to them that he wasn't going to follow the path of his family. He came here and stayed that whole summer (2011).

His mom is helping us with all the immigration and paperwork and according to her the state/courthouse has no files on him and his record comes back clean when he got a state record check for his current job.

Does anyone know anything about this/have advice? We are worried he will be rejected because of his past.
 
That should be fine. It may work to your advantage, because you proactively disclosed that (it may lessen the suspicion).. Example: I had some stuff in my past while I was a young kid (nothing terrible). I was pulled over with no license on me (I was licensed). I gave my personal details. When asked about previous stuff, I told the officer straight up. He went to his car to run checks. He returned to thank me for my complete honesty (because I was a young offender, so that information was not available to him), and to tell me to slow down and drive safely. He totally had me doing 25 over the limit...

Now, CIC is not the same as police, but the story is only to offer an example how it could work to your advantage.
Hahha. Same happened to me.
I was parked though and had left my wallet in my gym bag in my locker. A friend called and was just broken up with so I went over to talk and I parked on the side of the road. The cop showed up thinking we were having sex. after I just let him know "I have a licence, but I guess I left it in my gym bag." (I was freshly showered and wearing comfy clothes) Luckily I knew my DL number by heart and he was fine with it. Just told me to drive home safe so I don't get pulled over on the way home.