[□] □
[□=□] □
[□ | □] □
The potential of this assay to detect single nucleotide polymorphism is also tested . These initial opiate test concentrations were selected in an attempt to provide the greatest opportunity to identify anyone who may have used heroin ; however , at the 300 ng / mL concentration , many who have not used heroin but had taken a prescribed codeine or morphine medication , including over the counter products , or eaten normal dietary amounts of poppy seeds have also tested positive . They were also tested at 8 months of age on the Bayley Scales of Infant Development adapted for nonhuman primates .