Looking on the internet deeply has found these results:

staff is the most popular phrase on the web.

staffs 12,020,000 results on the web	staff 19,350,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
The plural form staffs is less frequent but is used in both British English and North American English to refer to more than one group of people:the senator and ... They burn through their staffs like rocket fuel, a White House observer once noted . ... Terrorism, National Security Council and the USSOCOM and Navy staffs. 2. pl. staffs A rule or similar graduated stick used for testing or measuring, as in surveying. 3. pl. staffs. a. A group of assistants to a manager, executive, or other ... Many Hong Kong students use the word 'staff' wrongly, for example using 'staffs' to refer to a number of workers and 'staff' to refer to one worker. This is wrong ...	The amendment reflects Commission's need for more flexibility regarding staff expenditure. British General Wingate conferred with his staff. In 2008 it employed 508 staff. Technicians on staff, constantly producing. Inevitably, the prison staff also face an immediate danger. Phicorp needs feedback from medical staff. For any other requirements please contact our staff. Which DG staff have made visits; 3.

staffs

12,020,000 results on the web

staff

19,350,000,000 results on the web

More popular!

The plural form staffs is less frequent but is used in both British English and North American English to refer to more than one group of people:the senator and ...
They burn through their staffs like rocket fuel, a White House observer once noted . ... Terrorism, National Security Council and the USSOCOM and Navy staffs.
2. pl. staffs A rule or similar graduated stick used for testing or measuring, as in surveying. 3. pl. staffs. a. A group of assistants to a manager, executive, or other ...
Many Hong Kong students use the word 'staff' wrongly, for example using 'staffs' to refer to a number of workers and 'staff' to refer to one worker. This is wrong ...

The amendment reflects Commission's need for more flexibility regarding staff expenditure.
British General Wingate conferred with his staff.
In 2008 it employed 508 staff.
Technicians on staff, constantly producing.
Inevitably, the prison staff also face an immediate danger.
Phicorp needs feedback from medical staff.
For any other requirements please contact our staff.
Which DG staff have made visits; 3.