After the Counter Strike: Global Offensive Operation Payback initiative rewarded community map makers, Valve rolled out another update allowing the community to moderate the disruptive behaviour of other players.
The "investigators", the more experienced members of the community, review player reports to determine if those accused will receive a temporary ban for their behaviour. Overwatch investigators will see an Overwatch button in the main menu notifying them of a pending report in need of evaluation. The investigators then review gameplay video which then requires a collective investigator agreement to determine if the player will receive a ban.
Factors such as Skill group, playtime, account age, competitive wins, etc, will determine if a player will qualify for investigator status. If these qualified players maintain their credentials, they can continue to participate in the Overwatch initiative.
In case you absolutely destroy the other team and to spite you the opposing team reports you for hacking, the Overwatch system will consider the types of reports and whether or not they come in a concentrated bunches or accumulate over time.
Of course, not all reports will automatically punish the accused player; some cases will receive different levels of verdicts. Some cases can receive a "Majorly Disruptive" status usually equated with cheating and some cases can receive a "Minorly Disruptive" status usually to convict griefers. And if the reported case resulted from an opposing player's jealously of your skill, an "Insufficient Evidence" status remains an option.
As investigators continue to evaluate reported players, their verdict can carry substantially more weight than investigators will less experience. With a relatively small community seriously committed to play Counter Strike, the Overwatch update will let players reward the dedicated bunch and weed out those aim to ruin matches.
Source: Counter Strike Blog