I would avoid potential TM domains like the plague. I paid 5 figures in damages once early in my career for a domain that had earned me less than $100. There are plenty of other domains and other routes to monetisation. Many people believe that if things go wrong they can always hand the domain over or attempt to get it deleted - this does not work if someone is intent on suing you.
However if you think it's a *possible* tm violation and, for some reason, you want it and have no intention of trading in the same area as the tm then consult a lawyer. Paying to get someone legal to look into it can save you potential fortunes in the long run.
Remember UDRP and domain disputes are totally irrelevant if you are dragged to court to face a legal suit.
You can check the US tm and patents at
https://www.uspto.gov/
UK
https://www.gov.uk/search-for-trademark
Canada
http://www.ic.gc.ca/eic/site/cipointernet-internetopic.nsf/eng/h_wr00002.html
Australia
https://search.ipaustralia.gov.au/trademarks/search/quick