I ususally just look at the Driver and Vehicle SEA's and see what those scores are. I also look at the violations to see if there's anything really serious if they have a really high score. If they do have a high score than I go to the Carrier Safety Rating Enquiry on the MTO website to see if they have been audited see how they did. I find the site really helpful because it provides you with the data of all the violations, like weather they have things like log book violations, or driving under the influence.