I'm not an expert, but from what I understand, there are three major classifications of criminal offenses: indictable, summary and hybrid.
From the perspective of immigration, hybrid offenses (such as DUI) are considered indictable, regardless if the actual charge is pursued summarily.
But for the purpose of applying for citizenship, the ruling of Ahmed vs. Canada provides precedence for more flexible interpretation of hybrid offenses where the judge has elected to proceed by ways of summary conviction.
http://reports.fja.gc.ca/eng/2010/2009fc672.html
https://defencelaw.com/criminal-charges-impact-on-citizenship/
So if you got charged of a hybrid offense, but eventually got convicted summarily, then there may be a way to avoid the 4-year bar for indictable offenses (again, a consultation with a lawyer may be required).
Regarding criminal record, another thing of note for permanent residents is that, everytime a non Canadian citizen is commits a crime, CBSA would be notified, and a section 44 report may be filed to IRCC (might be an oversimplification, but I think that should cover the gist of it).
http://wiki.clicklaw.bc.ca/index.php?title=I'm_a_Permanent_Resident_and_Have_Been_Charged_with_a_Criminal_Offence
The IAD may decide to hold an inadmissibility hearing, which may result in removal order.
If you are convicted of a 'serious' crime, then you would not be able to appeal this removal order (which means, you lose your PR status, and you would have to leave the country).
A serious crime is defined as follows:
1. A prison term of 6 months or more (as per a very recent ruling of the Canadian Supreme Court, fortunately now conditional sentences do NOT count as prison term)
2. A crime with maximum sentence of 10 years or more
It does not mean, however, that a conviction of a serious crime would necessarily lead to a deportation of the permanent resident in question. The CBSA agent has the discretion not to file a section 44 report.
The immigration lawyer, Raj Sharma, broke it down nicely in the following video:
IMO, green card holders have more of a fighting chance than Canadian permanent residents dealing with criminal charges.
Relatively minor crimes can easily result in 7 or 8 months of prison term, and in such case, a PR would have to solely rely on the discretion of border agent not to file a Section 44 report.
Even a super minor crime can still lead to CBSA writing a report to IRCC which results in removal order, which you would then have to appeal (and can still lose and be deported).
It's unfortunate, and draconian (IMO), but the rule is what it is.
Permanent residents should make it their upmost priority to stay out of trouble, at all times
