Exhibit 23.1 CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (No. 333-116076), Form S-8 (No. 333-114512) and Form S-4 (No. 333-112309) of Laidlaw International, Inc. of our report dated November 6, 2006 relating to the financial statements, management's assessment of the effectiveness of internal control over financial reporting and the effectiveness of internal control over financial reporting, which appears in this Form 10-K. PricewaterhouseCoopers LLP Chicago, Illinois November 6, 2006