All states have laws (statutes) that require landlords to install and maintain smoke detectors in leased residential premises (apartments, homes).

Some states such as Iowa, Maine, Massachusetts, Ohio, and Vermont require photoelectric or ionization sensors—at least in new construction. And Oregon requires smoke detectors with a HUSH mechanism that allows the alarm to be silenced or temporarily desensitized for 7 minutes while a known condition such as cooking is causing the alarm to activate.

Most states also require landlords to install and maintain carbon monoxide detectors in leased residential premises. Smoke and carbon monoxide detectors are widely available in the same device.

In Mississippi, landlords are required by law to install and maintain smoke detectors in leased residential premises. The Mississippi Code Annotated § 45-11-101 mandates that smoke detectors be installed in accordance with the manufacturer's recommendations and building codes. The law applies to all dwelling units, including apartments and homes. While Mississippi law does not specify the type of smoke detector technology to be used (such as photoelectric or ionization), it does require that the devices be maintained in good working order. Additionally, Mississippi Code Annotated § 89-1-61 requires carbon monoxide detectors to be installed and maintained in certain residential rental properties, particularly those with a fuel-burning heater or appliance, fireplace, or an attached garage. Landlords are responsible for the installation of these detectors, and they must ensure that the devices are operational at the beginning of each tenancy. It is important for both landlords and tenants to be aware of these requirements to ensure safety and compliance with state regulations.