Eventually everyone runs into someone they think is cheating or hacking. In the event that you're curious about the person in question we have provided some helpful links where you can check up on a player. It's not a perfect system, but if someone is very obviously cheating, odds are they will show up in one of the many databases that keep track of suspicous stats.
BF4DB lets you know if a player has been banned in a BF4DB server, or any other server protected by their plugin. Searching a name will give you a rating next to the players name. Clicking this box will take you to their stats. The fishy stats will appear in color-coded stages of normal to highly suspicous.
BF4 History shows the subject's account history. This includes bans, name changes, and any other activity regarding their cheating career. You must register an account on the site to use the search function.
BF4 Stats is much like battlelog, but will give you a more detailed account of a players statistics; including time played in vehicles, and increase or decrease in a specific stat over time. This is what i-stats grabbed their information from before they went down. You may need to click the orange "update player" box to get an up-to-date assessment.