Near-IR diagnostic diagrams applied to our CEERS selected sample at 1 < z < 3. Optical star-forming galaxies and AGN are drawn with blue and red circles, respectively. Hidden AGN (i.e., optical star-forming but near-IR AGN) are identified as cyan crosses. Optical star-forming galaxies with upper limits are drawn without symbols in blue if their line ratios are still consistent with being star-forming. The red dashed and blue continuous lines represent the maximum AGN and starburst limits (respectively) according to our models. The analytical form of the separation lines is described in Eq. (1), using the coefficients listed in Table 6.