A blood detector system for detecting a blood leak at an intravenous injection site comprising: a blood sensor (122, 10, 60, 600) comprising: a support structure, a color sensor (12, 612) attached to the support structure, the color sensor adapted to detect light from a sensing region adjacent to the color sensor, and the color sensor being configured to detect one or more of the reflected light of a frequency associated with blood and the emitted light associated with the bio-fluorescence of blood, an electronic transmitter attached to the support structure, an antenna coupled to the electronic transmitter, a power source connected to the electronic transmitter and the color sensor; and a receiver unit in communication with the blood sensor comprising: a receiver for detecting one or more signal transmissions from the blood sensor, a controller in communication with the receiver, and an alert system in communication with the controller; characterized in that the blood sensor comprises an attachment device for attaching the blood sensor to a blood line, wherein the attachment device is adapted to position the color sensor above an entry point of an intravenous needle of the blood line. a blood sensor (122, 10, 60, 600) comprising: a support structure, a color sensor (12, 612) attached to the support structure, the color sensor adapted to detect light from a sensing region adjacent to the color sensor, and the color sensor being configured to detect one or more of the reflected light of a frequency associated with blood and the emitted light associated with the bio-fluorescence of blood, an electronic transmitter attached to the support structure, an antenna coupled to the electronic transmitter, a power source connected to the electronic transmitter and the color sensor; and a support structure, a color sensor (12, 612) attached to the support structure, the color sensor adapted to detect light from a sensing region adjacent to the color sensor, and the color sensor being configured to detect one or more of the reflected light of a frequency associated with blood and the emitted light associated with the bio-fluorescence of blood, an electronic transmitter attached to the support structure, an antenna coupled to the electronic transmitter, a power source connected to the electronic transmitter and the color sensor; and a receiver unit in communication with the blood sensor comprising: a receiver for detecting one or more signal transmissions from the blood sensor, a controller in communication with the receiver, and an alert system in communication with the controller; characterized in that the blood sensor comprises an attachment device for attaching the blood sensor to a blood line, wherein the attachment device is adapted to position the color sensor above an entry point of an intravenous needle of the blood line. a receiver for detecting one or more signal transmissions from the blood sensor, a controller in communication with the receiver, and an alert system in communication with the controller; characterized in that the blood sensor comprises an attachment device for attaching the blood sensor to a blood line, wherein the attachment device is adapted to position the color sensor above an entry point of an intravenous needle of the blood line.