To expand on that Dani sneaky implies multiple domains. The CJ link takes you from your site to cj to the 3rd party site in one click. Google calls that sneaky. They don't seem to mind however if the middle page is on the same domain e.g. your site to your redirect page to the 3rd party site.
Keep in mind that they DO mind affiliate links in general on pages with not much of value but as far as sneaky goes it involves multiple domains, especially if not owned by the same entity.
By that definition adsense links are sneaky and Google's own shopping section is pure spam. If Panda were applied to Google they would be banished from search, nice double standard.