Diabetes screening

A local pharmacy is considering establishing a diabetes screening service looking at case selection. They intend to develop this service for the patients that attend pharmacy and intend to publish their result.
Questions
(1) Define the following:
(a) Population based screening for Diabetes
(b) Case selection screening for diabetes
- What evidence is there for population based screening for diabetes versus case selection?
(2) Define Community-Based Screening for Prediabetes and Diabetes & Why do the world Diabetes bodies seem to have reservations on Community-Based Screening for Prediabetes and Diabetes?
(3) Which group of patients would you expect to have the highest risk in terms of developing diabetes (ADA Criteria for screening for Type 2 Diabetes in Asymptomatic adults is very important to know!!!!)?