This will vary based on the countries that you have lived in. Often, the typical express entry applicant would have lived in at least two countries, especially if you went for a masters or college outside your home country. Thus, one would have to get police clearances for all those countries in which they have spent more than six months.
We will find out the procedure for these countries and help you arrange these documents. For some fingerprints may be required, or simply an application online. Leave it to us to find out!