Mo. Rev. Stat. § 34.045

The commissioner of administration may waive the requirement of competitive bids or proposals for supplies when the commissioner of administration has determined that there exists a threat to life, property, public health or public safety or when immediate expenditure is necessary for repairs to state property in order to protect against further loss of, or damage to, state property, to prevent or minimize serious disruption in state services or to ensure the integrity of state records. Emergency procurements shall be made with as much competition as is practicable under the circumstances.