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McKESSON CORPORATION
53
REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the Board of Directors and Stockholders of McKesson Corporation:
We have audited the accompanying consolidated balance sheets of McKesson Corporation and subsidiaries (the
“Company”) as of March 31, 2012 and 2011, and the related consolidated statements of operations, stockholders’ equity and cash
flows for each of the three fiscal years in the period ended March 31, 2012. Our audits also included the consolidated financial
statement schedule (“financial statement schedule”) listed in the Index at Item 15. We also have audited the Company’s internal
control over financial reporting as of March 31, 2012, based on criteria established in Internal Control — Integrated Framework
issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company’s management is
responsible for these financial statements and financial statement schedule, for maintaining effective internal control over
financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included in the
accompanying Management’s Annual Report on Internal Control Over Financial Reporting. Our responsibility is to express an
opinion on these financial statements and financial statement schedule, and an opinion on the Company’s internal control over
financial reporting based on our audits.
We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United
States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all
material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts
and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by
management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting
included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness
exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits
also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits
provide a reasonable basis for our opinions.
A company’s internal control over financial reporting is a process designed by, or under the supervision of, the company’s
principal executive and principal financial officers, or persons performing similar functions, and effected by the company’s board
of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and
the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A
company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of
records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2)
provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in
accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made
only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance
regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a
material effect on the financial statements.
Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or
improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a
timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future
periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of
compliance with the policies or procedures may deteriorate.
In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial
position of McKesson Corporation and subsidiaries as of March 31, 2012 and 2011, and the results of their operations and their
cash flows for each of the three fiscal years in the period ended March 31, 2012, in conformity with accounting principles
generally accepted in the United States of America. Also, in our opinion, such financial statement schedule, when considered in
relation to the basic consolidated financial statements taken as a whole, presents fairly, in all material respects, the information
set forth therein. Also, in our opinion, the Company maintained, in all material respects, effective internal control over financial
reporting as of March 31, 2012, based on the criteria established in Internal Control — Integrated Framework issued by the
Committee of Sponsoring Organizations of the Treadway Commission.
/S/ Deloitte & Touche LLP
San Francisco, California
May 2, 2012