Randall was suspended for two years after she too failed a drugs test during the 2013 national trials.
Robinson, a former Jamaican national junior representative who also competes in triple jump, was suspended for using a selective androgen receptor modulator (SARM).
The ban for Robinson, who is currently studying in the United States, will be retroactive to June 16 2013 when he provided the positive sample at Jamaica's national junior trials.
The 20-year-old will be eligible to compete again on June 17.