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<!-- Compliance Xpressware Instance Document http://www.compliancexpressware.com/  -->
<!-- Version: 1.0.0 --><!-- Creation date:13:23:51 GMT-0500 -->
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        <link:definition>107 - Disclosure - BASIS OF PRESENTATION</link:definition>
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        <link:definition>111 - Disclosure - CAPITAL STOCK</link:definition>
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        <link:definition>112 - Disclosure - STOCK BASED COMPENSATION</link:definition>
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        <link:definition>113 - Disclosure - STOCK PURCHASE WARRANTS</link:definition>
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        <link:definition>114 - Disclosure - RELATED PARTY TRANSACTIONS</link:definition>
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        <link:definition>115 - Disclosure - PLANT AND EQUIPMENT</link:definition>
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        <link:definition>116 - Disclosure - INCOME TAXES</link:definition>
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        <link:definition>117 - Disclosure - COMMITMENTS</link:definition>
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        <link:definition>118 - Disclosure - SEGMENT DISCLOSURES</link:definition>
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        <link:definition>119 - Disclosure - CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS</link:definition>
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        <link:definition>121 - Disclosure - SETTLEMENT OF ACCOUNTS PAYABLE</link:definition>
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        <link:definition>122 - Disclosure - SUBSEQUENT EVENTS</link:definition>
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        <link:definition>123 - Disclosure - RESEARCH AND PRODUCT DEVELOPMENT</link:definition>
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        <link:definition>124 - Disclosure - Summary of Significant Accounting Policies (Policies)</link:definition>
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        <link:definition>125 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
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        <link:definition>126 - Disclosure - ACCOUNTS PAYABLE AND ACCRUED LIABILITIES (Tables)</link:definition>
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        <link:definition>127 - Disclosure - STOCK BASED COMPENSATION (Tables)</link:definition>
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        <link:definition>128 - Disclosure - STOCK PURCHASE WARRANTS (Tables)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>129 - Disclosure - PLANT AND EQUIPMENT (Tables)</link:definition>
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        <link:definition>130 - Disclosure - INCOME TAXES (Tables)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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      <link:roleType roleURI="http://www.securitydevicesinternational.com/taxonomy/role/NotesToFinancialStatementsDebtDisclosureTextBlockTables" id="role_NotesToFinancialStatementsDebtDisclosureTextBlockTables">
        <link:definition>131 - Disclosure - CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS (Tables)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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      <link:roleType roleURI="http://www.securitydevicesinternational.com/taxonomy/role/DisclosureNatureOfOperationsDetails" id="role_DisclosureNatureOfOperationsDetails">
        <link:definition>132 - Disclosure - NATURE OF OPERATIONS AND GOING CONCERN (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
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        <link:definition>133 - Disclosure - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>134 - Disclosure - CAPITAL STOCK (Narrative) (Details)</link:definition>
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        <link:definition>135 - Disclosure - STOCK BASED COMPENSATION (Narrative) (Details)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>136 - Disclosure - STOCK PURCHASE WARRANTS (Narrative) (Details)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>137 - Disclosure - RELATED PARTY TRANSACTIONS (Narrative) (Details)</link:definition>
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        <link:definition>138 - Disclosure - INCOME TAXES (Narrative) (Details)</link:definition>
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        <link:definition>139 - Disclosure - COMMITMENTS (Narrative) (Details)</link:definition>
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        <link:definition>140 - Disclosure - SEGMENT DISCLOSURES (Narrative) (Details)</link:definition>
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        <link:definition>141 - Disclosure - CONVERTIBLE DEBENTURES AND DEFERRED FINANCING COSTS (Narrative) (Details)</link:definition>
        <link:usedOn>link:calculationLink</link:usedOn>
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        <link:definition>142 - Disclosure - SETTLEMENT OF ACCOUNTS PAYABLE (Narrative) (Details)</link:definition>
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        <link:definition>143 - Disclosure - SUBSEQUENT EVENTS (Narrative) (Details)</link:definition>
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        <link:definition>144 - Disclosure - Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details)</link:definition>
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        <link:definition>145 - Disclosure - Property, Plant and Equipment, Schedule of Significant Acquisitions and Disposals (Details)</link:definition>
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        <link:definition>146 - Disclosure - Schedule of Accounts Payable and Accrued Liabilities (Details)</link:definition>
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        <link:usedOn>link:presentationLink</link:usedOn>
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        <link:definition>147 - Disclosure - Schedule of Share-based Compensation and Assumptions as of January 4, 2012 (Details)</link:definition>
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        <link:definition>148 - Disclosure - Schedule of Share-based Compensation and Assumptions as of October 3, 2012 (Details)</link:definition>
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        <link:definition>149 - Disclosure - Schedule of Share-based Compensation and Assumptions as of October 26, 2012 (Details)</link:definition>
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        <link:definition>150 - Disclosure - Schedule of Share-based Compensation, Stock Options, Activity (Details)</link:definition>
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</xsd:schema>
