Why am I being taxed on monitoring?

Why am I being taxed on monitoring?

Please refer to the below link for Maryland tax regulation:   http://taxes.marylandtaxes.com/Business_Taxes/Business_Tax_Types/Sales_and_Use_Tax/Tax_Information/Special_Situations/Security_Services.shtml   Please refer to the below link for Washington, DC tax regulation:   http://otr.cfo.dc.gov/publication/dc-sales-and-use-tax-applies-sale-or-charges-armored-car-private-investigation-and