Duplication and redundancy in WBSNs refer to collect the same vital signs, using sensor attached on the patient body, over a period of time. Transmitting duplicated and similar data well consume the sensor battery faster, and increase the traffic in the network. Therefore, in this paper, we introduce a lightweight technique to detect duplicates data, using statistic test to identify the similarity between the data. Then preventing the sensor from sending this duplicated data,which leads to increase the lifetime of the sensor, and reduce energy consumption.