Adulterants in MDMA

Individuals who use MDMA risk ingesting unknown substances, which are often found in illicitly purchased ecstasy pills, capsules, tablets, and powders. They may think they’re purchasing ecstasy when they are, in fact, buying other substances instead of or in addition to MDMA.10,11 These substances can vary widely, and may include:

Fentanyl. In 2020, more than 10,000 psychostimulant-involved overdose deaths (mostly methamphetamine) also involved synthetic opioids (primarily fentanyl).6
Amphetamines. Amphetamines, such as methamphetamine, can produce similar effects to the stimulant properties of ecstasy. Thus, amphetamines are often sold in place of or with MDMA. Moderate doses can produce adverse health effects, including mood disturbances, anxiety, insomnia, and addiction. High doses can cause overdose and death.2
Para-methoxyamphetamine(PMA)/para-methoxymethamphetamine (PMMA). Both PMA and PMMA are illicit stimulants that have been detected in samples of MDMA or masqueraded as MDMA entirely. Case reports have found evidence of PMA- and PMMA-related deaths in individuals who use ecstasy.2
Dextromethorphan (DXM). An ingredient found in over-the-counter cough suppressants, DXM can cause a “high” similar to ecstasy when taken in high doses due to its dissociative/euphoric effects. However, adverse effects at high doses include drowsiness, elevated heart rate, poor muscle control, involuntary eye movements, and an increased risk of heatstroke.2
Ketamine. Ketamine is a dissociative anesthetic with hallucinogenic properties. It is often discovered in contaminated MDMA samples.2
Caffeine. Caffeine may be added to MDMA to bulk up the sample and because its stimulant properties may create effects that are similar (but milder) to MDMA.2
Eutylone and other synthetic cathinones. Colloquially referred to as bath salts, eutylone and other synthetic cathinones have been detected in MDMA samples. In fact, the supply of eutylone increased so rapidly in the United States from 2017-2021, that authorities issued public alerts about the potential risk of overdose associated with it. Studies show that roughly 1 in 10 eutylone-involved deaths in 2020, had evidence of current or past MDMA use but no toxicology findings of MDMA, which supports the idea that individuals unintentionally ingest eutylone when they think they are taking MDMA.12    

I started partying 20 years before you when you could take pills and cops just let you drive on after doing the alcohol test. 😂 They didn't know shit for years.
Also years before MDMA was commonly sold to end users.
I never tested pills, I got them from reliable sources.
But from experience with other substances you know and recognise their presence occasionally, some trippy, some speedy.
And confirmed by others using the same.
No test needed.

I'm very surprised you don't have any results showing that.

Nobody will ruin their name or product by putting large amounts of totally different substances in it with unforseen and dangerous consequences but besides color, shape and logo, a touch of something speedy or hallucinogenic as unique selling point sounds like something to expect.
There is not only plain chocolate, but chocolate with nuts, fruits, caramel, etc...