Transact SQL :: Loop On Rows - Count Of Documents For Each Supplier

I have 3 tables: Suppliers, Documents and Verification, each document may have multiple verification where I need to get the last verification according to verification date. So I just need a "Select top 1 result from Documents, Verification where doc_iddoc=ver_iddoc and result='True' order by ver_date desc" so far I get the result of the last verification, but here's the problem:

I need to get a row with the count of documents for each supplier, I mean:

Supplier Name     Docs      NegativeVerification
Acme Co                10                     1

that is I would need to loop for each supplier and each document and get the last verification, if one of any of documents have negative verification then add it to negative results. Is it possible to achieve this with a query or do I have to do it through stored procedure?